Frequently Asked Questions


Will Armalite sell my personal information to other companies?

Absolutely not. Detailed information regarding our privacy policy can be found in our Privacy Policy section. Merely click on it at the bottom of our Home Page. If you have other questions, please contact us.


What is the status of my order?

The stunningly high level of orders, combined with turbulence in delivery or acceptance of supplies, makes it impossible to provide accurate lead-time forecasts. Remember that a single delay or quality rejection affects literally THOUSANDS of rifles in the production schedule. Under those conditions, we cannot respond to requests for status. We tried, but the level of requests is absolutely higher than the staff can handle even if they did nothing else at all.

What is Armalite’s policy on selling firearms and components to individuals?

Armalite only sells firearms and components in accordance with federal laws. If you have other questions, please contact us.

I ordered a rifle from my dealer on (00/00/0000). Do you have the order in your records? When will my rifle ship?

All status info from your dealer must come from that dealer. Please remember that many dealers order through distributors, and even if the dealer ordered directly from us, we don’t know which order is dedicated to specific customers. Most importantly, normal business practices dictate that we must communicate through the parties who order from us rather than directly with their customers. Please forgive the inconvenience.

I am in the midst of building a custom Armalite and need some parts. Why aren’t you shipping them?

We are now taking orders for even scarce items, but can ship only as supplies allow, and parts are heavily backordered. Some items cannot be shipped because dispatch of those items literally prevents us from shipping a rifle. Rifle shipments must take priority for the moment. We’re pulling supplies in to support the important need for parts and other supplies. Please be patient with us.

Could you tell me from which date orders are shipping? My order number is **** in case you ship by numerical order.

No, as noted in a previous FAQ, we cannot accurately forecast shipping dates. Because one erroneous forecast merely generates many later requests for status, we’ve had to halt status reports until we definitely know when materials will be on hand. At that time, we call each customer due to receive product.

We try to ship in order sequence, and this generally works well with individual orders for parts and accessories.

It does not work well for complete rifles because huge orders placed by many customers block any deliveries to other customers for many months. In this case, we try to allocate some product fairly to everybody. We feel it’s better to get something to many of our friends and customers than to deliver many rifles to the early few who ordered.

We know we won’t satisfy anybody completely, but we can satisfy many customers partially. Please understand that we’re pressing to resolve the situation as quickly as possible. It will seem to you that nothing is being accomplished until you’re notified of your shipment. We apologize to you for any irritation.

Does Armalite accept checks by fax?

No. At this time, Armalite does not have the capabilities to accept checks by fax. For more information see the Contact Us and Policies sections of our website.

What payment options does Armalite offer its retail customers?

Our retail customers have the option to pay via Visa, Master Card, and Discover credit card, COD certified funds, or to pre-pay via personal check, bank checks, or money order. We reserve the right to hold shipment until personals check clear. See the Policies section of our website for more information.

What payment options does Armalite offer its dealers?

We offer the same terms as set forth in the previous question, along with COD Company check, Net 10, Net 15, Net 20, and Net 30. See the Policies section of our website for more information.

How do I obtain Net terms or COD Company check?

Contact our Customer Service or [email protected] and an application for credit will be sent to you.

Can retail customers obtain Net terms or COD personal checks?

No. At this time Armalite allows only dealers to obtain Net or COD check terms.

If I place an order with my credit card and the items are back ordered, will my card be charged?

Armalite will not charge your credit card until the time your order is shipped. See the Policies section of our website for more information.

How do I become an Armalite dealer?

If you currently hold a Federal Firearms License, all you need to do is email or fax a signed copy to us. To make it easy for us to contact you, please include your phone number and email address on the FFL. You’ll get dealer pricing for all firearms, parts, and accessories with no minimum to buy, and we won’t bill you till the product ships. If you don’t have an FFL, ask your dealer to become an Armalite dealer in your behalf.

Can you tell me where I can find a dealer in my area?

Any dealer who possesses a Federal Firearms License may order from us. Make sure to check out our dealer locator.


Why do I get an error message when I try to place my web order?

The most common cause of errors when placing orders is customers attempting to use American Express cards. The website does not take American Express.

Can I get my dealer pricing on orders placed on the website?

Yes, just email a signed copy of your FFL and tax information to [email protected]

If I place an order over the phone, can I see it on your website?

Yes, if you have previously created a web account and ordered with it, our sales rep will have the ability to use your web customer number to place your order. You will then be able to check its progress.


What are Armalite’s policies regarding use of your website and purchasing firearms?

Most questions regarding the terms and conditions of using our website and purchasing from us can be answered by reading our Terms Of Use section. Merely click on it at the bottom of our Home Page. If you have other questions, please contact us.



If you would like to return an Armalite firearm for repair or have accessories installed, please contact our Repair Department at 800.336.0184 ext 126 or use the Customer Service section.  After talking to the Repair Department you will be given a Return Materials Authorization (RMA) number and instructions on how to ship your product into Armalite.  You can email them at [email protected] as well.


If you would like to return a recently purchased Armalite product, please contact our Customer Service Department at 800.336.0184 or use the Contact Us section.  After talking to an Armalite Customer Service Representative you will be given a Credit Return (CR) authorization number and instructions on how to ship your product into Armalite.


What is a Wylde Chamber?

What is 223 Wylde? 223 Wylde is a specific chamber size originally designed for precision shooting to make the best use of case pressure. 223 Wylde incorporates a longer throat. A longer throat in the chamber allows the shooter to utilize longer length bullets such as the 80 grain HPBT Sierra MatchKing.

What does that mean for 223 Rem and 5.56 Nato (5.56X45)? Your Eagle CAN fire any 223 Rem or 5.56 NATO rounds. The difference between those two rounds is the case pressure, with the 5.56 having the greater of the two. The 223 Wylde chamber was developed to shoot both and achieve optimal accuracy with either.

My rifle doesn’t work right. What should I do?

Most technical problems can be resolved by carefully reading the owner’s manual for your firearm. Owner’s manuals for all Armalite firearms can be found in the Library section of our website. If you want a hard copy, just call or email. (See the Contact Us section of our website.) Our manuals are updated as we make design changes or as we receive questions from customers. It’s a good idea to download the most current manuals.

If you want even more technical information, we suggest that you review our Technical Notes in the Library.

If you still have a problem after reviewing the latest owner’s manual and Technical Notes, thoroughly cleaning the firearm as explained in the manual, and absolutely assuring that your ammunition is not defective, feel free to contact our technical support personnel.

Functional problems must be analyzed as “system” problems. We must consider the firearm, the ammo, the mounting conditions, maintenance schedules, and the shooter.

When you contact us, it’s important for you to have as much specific information about your problem as possible. Information that’s very helpful to us includes:
— Model of the firearm
— Serial number of the firearm
— Sights or scope being used
— Manufacturer and specific type of ammunition being used (including bullet weight)
— How the rifle or pistol was mounted or held (e.g. shoulder fired, bench rested, one-hand firing) and how tightly was it being held
— Approximate number of rounds previously fired from the firearm
— Approximate number of rounds fired since the firearm was cleaned and method of cleaning previously used
— The specific nature of the malfunction or problem encountered.
In order to provide meaningful support to you, we’ll need you to be as specific as possible about the problem. (There’s simply no way to analyze “My rifle doesn’t work.”) Let us help you diagnose your problem.

There are eight steps in the cycle of functioning of any firearm. They are:
1. Firing – Pulling the trigger to release the hammer or striker to fire the cartridge, 2. Unlocking – Turning the bolt to release it from the barrel, or (in a pistol, tipping of the barrel to release it from the slide,
3. Extracting – Pulling the fired case out of the chamber,
4. Ejecting – Throwing the empty case clear of the firearm,
5. Cocking – Resetting the hammer or striker so that it is ready to be released to fire the next cartridge,
6. Feeding – Pushing the next cartridge out of the feed lips of the magazine.
7. Chambering – Pushing the cartridge up the feed ramp and into the chamber,
8. Locking – Rotating the bolt or (in a pistol) lifting the barrel so that it is held in place to support the cartridge for the next shot.
Try to determine which step in the cycle of functioning is not being performed successfully and provide that information to us.

In addition to cycling problems, it is possible to have a problem with the firearm’s controls including the safety and the bolt (or slide) stop. If you have a problem with any of the firearm’s controls, describe the problem as specifically as possible.

I want to replace the stock of my Armalite carbine and want to know if it is built with a Mil-Spec or commercial tube design.

Armalite currently uses Mil-Spec diameter receiver extensions (buffer tubes). But, previously we used commercial diameter tubes. We can’t tell what you have without knowing the tube diameter. If you tube has a diameter of 1.145 – 1.147 inches (approx) it is Mil-Spec diameter. Anything else is commercial. Note that there is a tolerance in both Mil-Spec and commercial tubes and stocks. The stock will tend to have a little play in it.

Can a DPMS/POF/KAC/RRA upper be put on an Armalite lower receiver?

You can install Colt or high quality components made to military standards to Armalite M15 lower receivers, but Armalite doesn’t recommend it. We recommend that you use Armalite upper receivers for optimal fit, matching to the deep black color of your Armalite receiver, and the basic knowledge that your rifle isn’t totally mixed up.

No other brand of upper receiver fits the Armalite AR-10 family of rifles.

What are the differences between the Armalite Tactical and Match triggers?

The mechanisms are based on the same basic design. The difference is the location and shape of the trigger bow, different weights of pull, and tuning the second stage hook in a manner similar to the M14.

The NM trigger bow is mounted farther forward for better trigger finger placement, while the Tactical Two-Stage trigger has the same bow as the usual single stage trigger of the M-16. The trigger weight of the installed NM trigger is approximately 2 pounds lighter than the Tactical Two-Stage trigger, and the NM trigger is tuned so that the shooter won’t be distracted by movement in the second stage.

The two triggers serve different purposes, so a single standard isn’t practical. While NM triggers are outstanding for match use and for casual shooting, the officials of many Police or Military organizations require a trigger of higher weight.

Armalite may use untuned NM triggers as Tactical Two-Stage triggers in standard rifles when supply conditions require.

See the M-15 and AR-10 manuals for more information on our Match triggers.

How good is Armalite’s customer service?

I doubt that you will find better in the industry. There have been multiple internet threads on this subject from very satisfied customers. We bend over backwards to help you.

What’s the difference between Eagle Arms and Armalite?

There are normally very few differences. Armalite rifles are the top of the company’s line. They tend to be more up to date and include higher quality parts such as chrome lined barrels. They are produced from selected forging. However, internally, they use exactly the same parts. Eagle Arms rifles are intended to compete with lower priced brands. They are extremely high quality rifles in their own right. Armalite used to use only “Armalite” lower receivers for actual factory built guns and sold “Eagle Arms” as stripped lower and upper receivers. This was to differentiate between the two different warranties. Armalite has a lifetime warranty and EA has a one year only warranty. Armalite now offers “Armalite” stripped lowers for sale.

What is barrel lapping? Why are Armalite’s barrels lapped?

Barrel lapping is a method of smoothing the bore of a barrel. It involves polishing the bore by passing lead slugs up and down the barrel repeatedly. The slug is impregnated with fine lapping compound, which does the actual smoothing.

Barrels are lapped to smooth out machine marks left by the rifling process, and to make the bore diameter more uniform from one end to the other. The smoothed barrels don’t damage passing bullets as much as rougher barrels, and this reduction in bullet damage is linked to improved accuracy.

Armalite uses lapped barrels for both match and standard, chromed barrels. The benefit of lapping match barrels has already been addressed. Barrels to be chromed benefit from lapping too. Chrome deposits more evenly on smooth barrels. Since chroming tends to reduce accuracy, it makes sense to start with a lapped, accurate barrel before lapping to assure that the resulting chromed barrel is as accurate as possible.
Lead laps tend to wear out quickly. Three separate laps are therefore used on Armalite’s AR-30, AR-50 and all stainless barrels. Two laps are used on standard barrels.

What are the differences among types of muzzle devices?

A “Muzzle Brake” is a device that reduces recoil by redirecting gases rearward. It does not hide or eliminate flash. Physically, it typically contains slots or holes that angle rearward. It may greatly increase noise and blast rearward toward the shooter. And, it’s spelled “brake” not “break.”

A “Flash Hider” is a device that hides flash from the rear and sides. Physically, it is typically cone-shaped without any holes or slots on its sides. It does not reduce recoil or suppress flash. It merely hides flash. It may increase recoil somewhat.

A “Flash Suppressor” is a device that reduces flash by dispersing hot gases radially outward from the muzzle. Physically, it usually has holes, slots, or prongs that radiate outward completely around the suppressor, (or at least horizontally and upward from the suppressor).

A “(sound) Suppressor” is a device that reduces sound, flash, and recoil by containing and cooling hot gases in a cylindrical canister.

Do you still offer camouflaging?

Not generally although we do from time to time. (Camouflage coatings are not covered under warranty.)

What is the thread pitch on all of your muzzle brakes?

AR-10 = 5/8 x 24; M-15 = ½ x 28; AR-30 = 5/8 x 18 UNF-3A; AR-50 = 1 x 14

Will a sound suppressor affect the performance of my M-15 or AR-10?

Yes. A sound suppressor will increase the rate of fire, which may increase the rate of some malfunctions and may increase rate of wear on some parts. That’s why our Super SASS has a gas valve to reduce the amount of gas powering the gun when the suppressor is installed. When we manufacture rifles specifically for use with a suppressor, we reduce the size of the gas port appropriately. Please remember that only someone that holds a Class II federal license, individuals who purchase government-registered devices, and government agencies may own a sound suppressor.

What does LSA stand for?

Lubricant, Semi-fluid, Automatic firearms. It was specially designed in the 1960s for use on the M-16 rifle.

Does cryogenic (Cryo) treatment of barrels help in any way?

We have not seen any evidence that it helps. Armalite has frequently been offered cryogenic barrel treatment services, with promised increases in accuracy, life expectancy, and easier cleaning. In each case, we have stated that we would consider the treatment only when provided solid engineering data proving the promised benefits. No salesman ever returned with the data.

In late 1998, an experienced High Power competitor and official of Sierra Bullets, Mr. Kevin Thomas, published an excellent article in Precision Shooter magazine that reported results of a well designed test that confirmed no measurable benefit from the treatment.

Until independent, scientific evidence to the opposite is provided, Armalite will not resort to, or recommend cryogenic treatment.

What is the benefit of moly coating of bullets?

Moly coating refers to a coating of Molybdenum Disulfide applied to the exterior of bullets. It is a matter of great controversy among advanced competitive shooters. Some disciplines have embraced it, and others have rejected it.

We believe from range experience that moly coating of bullets may reduce barrel break-in time and may increase the interval between cleanings.

However, Mr. Thomas, of Sierra Bullets, ran a test of moly coating similar to his test of cryogenic treatment. He concluded that there was no improvement in accuracy or barrel life, and little benefit in cleaning.

Why does Armalite offer three types of barrels (chrome moly, chrome lined, and stainless steel)?

Each barrel has advantages suited to different uses.

Armalite’s chrome moly barrels have excellent internal surface finishes, and offer excellent accuracy for a reasonable price. Chrome lined barrels offer excellent corrosion protection and longer life expectancy, but are more expensive than unchromed barrels. In addition, the process of electro polishing the barrels, and the chroming process itself, tends to reduce accuracy somewhat. Stainless is easy to process to fine surface finishes, and provides moderate corrosion resistance.

Thus, chrome moly is used for Eagle Arms standard rifles, for good accuracy at a low price. Armalite A2 and A4 rifles, in both .223 / 5.56 and .308 / 7.62 normally are produced with chrome lined barrels for hard service use or use under adverse conditions, with stainless steel as an option. All Armalite match grade rifles, the Ts and National Match rifles, are made with stainless steel barrels for superior accuracy and good corrosion resistance.

How accurate are Armalite’s rifles?

That depends on which model you have. Armalite manufactures a wide range of rifles with barrels of different materials and different lengths. Generally, the stainless steel and unchromed barrels are more accurate that chrome lined barrels, but the chrome lined withstand moisture and wear better.

In general, when shooting match ammo from a bench or machine rest in calm conditions, our rifles will shoot the following sizes of 5-shot groups:
–Match grade rifles are guaranteed to have accuracy better than 1 minute of angle.
–Carbines with 16 inch long stainless barrels will shoot better than 1.5 minutes of angle.
–Chromed standard grade barrels will shoot within 2 minutes of angle.

A minute of angle (MOA) is approximately 1 inch per 100 yards of range.

What is “match” ammunition? How does it differ from “ball” ammunition?

The term “match” is much abused in the world of ammunition sales. too often, it’s applied to whatever a seller has on hand in order to sell it to innocents.

Properly used, the term is applied to ammunition that is assembled from specially produced or selected components to improve accuracy. Specially designed bullets, such as open-tip, especially uniform primers, specially weighed charges of stable powder, and high-quality very uniform cartridge cases are often used in match ammunition.

“Ball” ammunition is similar, but of standard quality, often using less expensive open-based bullets rather than open-tipped. It is ordinarily used for military or police use, or produced for sale at low prices to hobby shooters.

How many shots can be fired from a barrel before it has to be replaced?

Barrel life will vary greatly depending on the caliber of the rifle, the particular ammunition being fired, the rate of fire, how well and how often the barrel is cleaned, and how accurate the shooter insists the rifle must be.

Shooting tracer or armor piercing ammunition, or shooting the rifle as fast as the trigger can be pulled can ruin the barrel in just a few hundred rounds. Firing jacked lead-core bullets at reasonable rates with good cleaning often will allow a standard grade .223/5.56 or .308/7,62 barrel to last for up to 10,000 rounds with acceptable for police use. Target shooters fire at very moderate rates, but their higher accuracy requirements may dictate barrel replacement at approximately 7,000 rounds. The most intense 5.56 match loads with heavy bullets, such as those used by the Army Marksmanship Unit, may require barrel replacement as early as 2,500 rounds. More conservative loads may remain accurate for over 5,000 rounds.

Why does Armalite use mid-length handguards on M15s and AR-10s?

Mark Westrom developed the mid-length handguard (approximately 2 inches longer than the standard carbine handguard) for several reasons. The mid-length handguards provide a more optimal gas port location (and thus better gas pressure level, timing, and dwell) than short handguards. Mid-length allows more flexible positioning of the supporting hand than the cramped position required by the shorter handguards. Mid-lengths allow a barrel length compatible with mounting a bayonet; and they just plain look better than a short handguard with a long skinny barrel poking out the front. The Armalite barrels with mid-length handguards look more like the M4 barrel than short handguards with the long barrel section protruding.

Later development of rifles in different calibers have also benefited from the gas port location of the mid-length handguard.

Do both 7.62 NATO and 7.62 X 39 cartridges fire projectiles of the same diameter?

No. In spite of their similar designations, they do not fire the same diameter of projectiles, their cartridge cases are entirely different, and they are not interchangeable in any firearm. And firearms that fire them have different bore diameters. (7.62 NATO projectiles are 0.308” in diameter. 7.62 X 39 projectiles are 0.311” in diameter.)


Why does Armalite object to other companies calling their rifles “AR-10.”

First, we object because they aren’t AR-10®s. The AR-10 is a special rifle manufactured by Armalite. Second, the model term “AR-10® is a registered Armalite trademark and may be used only on Armalite rifles or rifles made under license.

Armalite spent a lot of money producing the AR-10 when no one else would. We have spent a lot of time building the name and reputation of this rifle and trademark law requires us to prevent others from infringing on the trademark.

In addition, assuring that our model designation is properly used only with our rifle reduces the likelihood of owners of problematic lower-grade semiautomatic 308 rifles from referring to their problems as “AR-10 problems”.

Can other (DPMS) mags be used in Armalite rifles?

No. You can only use Armalite proprietary GEN-II mags, or a modified M14 mags (GEN-I), or unmodified M14 mags held in the receiver with the sling.

Can I use M-15 parts in the AR-10.

Some, but not all, parts are interchangeable.

Will an AR-15 (CAR) stock fit an AR-10?

Yes (with caveats). You will need to use either the carbine AR-15 carbine lower receiver extension (buffer tube) with an AR-10 spring and a shorter AR-10 buffer (to allow for the longer AR-10 bolt carrier group) or an AR-15 stock and the AR-10 buffer tube (but it will not collapse all the way). The A2 stocks are the same. The AR-10 rifle buffer is a little shorter in the AR-10 rifle.

Can I build an AR-10 like an AR-15?

Yes. They are basically the same parts except you will need bigger tools (vise blocks). Armalite even offers a kits part #GSK10A4 (minus the lower receiver—-Call for info.) just for this purpose. Note: You can use a regular AR-15 barrel wrench to take off a standard AR-10 barrel nut, but you will need a special AR-10 barrel nut wrench to tighten the large AR-10(T) barrel nuts.

Who can build me a “custom” AR-10 rifle?

GA Precision, Mike Bykowski and John Noveske are current custom builders working with the AR-10 rifle. They are pricey, but you will hear nothing but good things about both companies.

Is the chamber on an AR-10 .308 or 7.62?

All of our AR-10s are NATO chambered and will accept both 7.62 and .308 ammo. The AR-10 can shoot 308 or 7.62 NATO. See the AR-10 owner’s manual for more detailed ammo information.

Where can I buy AR-10 lower receivers and parts? I don’t see them around.

You can order parts directly from Armalite or from DSG Arms and 762 SASS ( stocking dealers). If you want to order an AR-10 rifle, lower receiver, or parts, your FFL dealer can order one direct from Armalite.

Why are AR-10 mags more expensive that DPMS?

They are more expensive to build. Note that they employ a rather complex steel follower. This follower is much more expensive than the plastic followers of competing magazines but pay for themselves in smooth and reliable function

Why is the AR-10 more expensive than the some rifles that look similar?

Armalite rifles employ more expensive components and offer features those rifles don’t have (chrome lined barrels, lifetime warranty, better triggers, forged receivers, and Minute of Angle guarantees). These extras cost money.

Can I use an AR-15 gas tube on the AR-10?

AR-10 gas tubes are longer than the AR-15 tubes.

What size are the threads on the muzzle of an AR-10?

5/8 – 24

What Free Float handguard tubes can I use on my AR-10? Will an AR-15 gas tube work?

: Free float AR-15 handguards will generally work with the AR-10, but the barrel nuts require different gas tube hole spacing and the gas tubes themselves must be longer.

What range should I zero my AR-10A2?

If using standard NATO Ball ammunition (M80 or equivalent) you can zero for any range shown on the elevation knob. We recommend doing so at 300 yards so that elevation errors due to lot-to-lot ammunition variations are minimized over practical shooting distances.

What lowers are available for the AR-10 besides Armalite?

: As of now (summer 2008) there are three choices available in addition to the Armalite. You can get an Eagle Arms lower that is made by Armalite, you can get a Noveske N6 lower, and Aero Precision offers a lower. They will all work with AR-10 parts and magazines.

Why is my bolt locked in the bolt carrier?

This problem (normally found with very early rifles) and its resolution are explained fully in the owner’s manual. The bolt has been inserted too far into the carrier before inserting the cam pin and the gas ring has expanded behind a small ledge in the carrier.

When inserting the bolt into the carrier, the holes for the cam pin should align. Never insert the bolt past the cam pin hole.

Why won’t my port door stay shut?

It’s possible that the port door detent needs to be freed up. Tap gently on the door with a rubber or plastic hammer. If that doesn’t solve the problem, contact our service department. You may need to send in the upper half of your rifle.

Can you install an AR-30 muzzle brake on an AR-10?


What ammo do you recommend in my rifle?

Please see the Ammunition section of your owner’s manual.

Will the M-15 front sight tool fit the AR-10?


What’s causing my AR-10 to “double fire” ?

If you do not hold the rifle tightly to your shoulder and pull the trigger firmly, the recoil of the rifle may cause you to inadvertently pull the trigger twice. See Technical Note 32 in our Library for more information.

What are the torques on an AR-10 barrel nut and the gas keys?

At the factory, the barrel nut is torqued by feel. But, studies have shown the torque for the M15 should be 35 – 80 FOOT lbs. and for the AR-10 45 – 90 FOOT lbs. The torque for the gas keys for both the M-15 and AR-10 should be approximately 55 INCH lbs.

How are the new AR-10s different from older ones?

There have been three generations of AR-10 rifles. Armalite’s AR-10B series rifles art the third series in the historic family. The first, designated AR-10, was designed in the late 1950s and entered production in the early 1960s. Only about 10,000 rifles were produced. The second series, the AR-10A, was an improved version that didn’t enter production. The third series, Armalite’s new AR-10B, is the latest and most up to date. The series is normally referred to with the shorter AR-10 designation with no reference to the B.

Five models of the AR-10B series exist:
–AR-10B is the base model of the new Armalite line. It is loosely patterned after early 1960 era rifles, and is produced largely for nostalgic reasons. The charging handle looks like an upside down trigger and is located at the front of the carrying handle. It bears early M16 furniture in a brown epoxy finish and a rear sight elevation window at the rear of the carry handle.
–AR-10A2 is the Infantry model, virtually identical to the latest M16A2 Service Rifle, but scaled up for the 308/7.62 cartridge.
–AR-10(T) is the target model featuring a 20 or 24 inch long medium weight target barrel.
–AR-10A4 is a flexible combination of the AR-10A2 and the AR-10(T). It is generally identical to the AR-10A2 except that the upper receiver and gas block are manufactured with the “Picatinny rail” sight mounting surfaces of the AR-10(T). Removable metallic or telescopic sights are optional.
— SuperSASS is the most versatile AR-10 rifle inasmuch as its variable gas system is adaptable to a sound suppressor.
— Most variations of rifle have matching carbines except for the collapsible buttstocks and shorter barrels.

Why do some GEN I converted 20 round magazines have plain floorplates while others have Armalite’s logo on the floorplate?

This occurred to make Armalite compliant with the magazine provisions of the 1994 Crime Bill.

When Armalite modified an M-14 magazine by machining the AR-10 features into it, the conversion is obvious. The latch plate, for instance, clearly showed signs of the modification. an Armalite floorplate is installed for the satisfaction of the customer. In come cases, a brand new magazine box was substituted for the original, which was discarded. We did this if the old box was damaged in machining or was otherwise unsuitable for continued use. In these cases, an original floorplate was put on the new box to make absolutely sure that there was no question that an actual conversion took place.

In summary, every conversion provided the customer with a new floorplate or a new box, but not both. The situation may sound silly, but it is intended to assure that our customers are in compliance with the law.

What is the maximum rate of fire of the AR-10?

It is the same as that of the M-14 rifle in rounds per minute for a maximum period of:
— 2 minutes………………………….40 rounds per minute
— 10 minutes………………………..30 rounds per minute
— 20 minutes………………………..20 rounds per minute
— 30 minutes or more……………13 rounds per minute

See your owner’s manual for more information


What is a Wylde Chamber?

What is 223 Wylde? 223 Wylde is a specific chamber size originally designed for precision shooting to make the best use of case pressure. 223 Wylde incorporates a longer throat. A longer throat in the chamber allows the shooter to utilize longer length bullets such as the 80 grain HPBT Sierra MatchKing.

What does that mean for 223 Rem and 5.56 Nato (5.56X45)? Your Eagle CAN fire any 223 Rem or 5.56 NATO rounds. The difference between those two rounds is the case pressure, with the 5.56 having the greater of the two. The 223 Wylde chamber was developed to shoot both and achieve optimal accuracy with either.

If your M-15s are Mil-Spec, why don’t other manufacturer’s parts fit in my Armalite rifle?

Because their parts aren’t Mil-Spec.

What brands of ammunition do you recommend.

U.S. manufactured ammunition all works well. Companies such as Black Hills, Remington, UMC, and Lake City military surplus all make good ammo. Overseas military ammo such as South African and Chinese ammo does not always function properly. See your owner’s manual for more ammo info.

Why does the firing pin leave marks on primers of chambered, but unfired, cartridges?

This is normal in all manufacturers’ AR-15 style rifles as well as other designs such as the famed M-1 and M-14 rifles. The M15 firing pin does not have a spring that holds it rearward. Thus, as the cartridge is chambered and the bolt carrier stops, the firing pin is free to fly forward, slightly indenting the primer. However, the firing pin, by itself does not have enough energy to fire the cartridge.

The heavier AR-10 firing pin DOES have a spring installed to assure that its heavier weight won’t initiate a “slamfire.”

How do you remove A2 handguards and install 1913 handguards?

Simply pull back on the slip ring, remove the old handguards and replace with the new ones. Sometimes the 1913 handguards are a tight fit, so you may have to slide the front sight forward for more room to work. See your owner’s manual for more information.

What’s causing my M-15 to “double fire” ?

If you do not hold the rifle tightly to your shoulder and pull the trigger firmly, the recoil of the rifle may cause you to inadvertently pull the trigger twice. See Technical Note 32 in our Library for more information. This error is often confused with a slamfire.

Why is there a stamped eagle on the front of the magazine well?

It is a factory inspection stamp similar to, and sometimes confused with, the government acceptance stamp. It doesn’t include the additional characters of the government stamp.

It was initially used to mark Eagle Arms rifles that were built in the factory, to differentiate them from rifles built from Eagle Arms receivers. In addition, the company president didn’t think that our rifles looked right without the stamp.

The front sight base of my rifle has two screws running through it below the barrel. What are they for?

They are used on National Match, and occasionally on other rifles, to allow the owner to zero the front sight. Normal manufacturing tolerances may result in the rear sight being somewhat off center when the rifle is zeroed. Armalite’s exclusive clamp style front sight base allows the owner to zero the front sight for windage, and thus to center the rear sight. The military refers to this step as zeroing the rifle’s “mechanical zero.”

To do so, put the rear sight in the center of the rear sight base. Fire a three-shot group. To adjust the next shot group to the left, shift the front sight to the right (and visa versa). Tighten the clamping screws and finish zeroing in the normal manner using the windage knob of the rear sight. Elevation is adjusted normally.

The clamping screws also allow the sight base to closely seal the gases that pass through the base to the gas tube, this improving the power of the operating system.

My receiver has “EA15 J15” marking on it. Could you give me some background information about it?

Receivers with that marking are manufactured by Essential Arms out of Krots Springs, Louisiana. They have no affiliation with Eagle Arms nor Armalite, Inc.


Why won’t my bolt fit into my AR-30?

You may have installed your scope base incorrectly. One of the scope rail screws is shorter than the others. The short screw should be installed in the front hole. This is explained thoroughly in your owner’s manual.

Can I adjust the trigger pull in my AR-30?

The AR-30 trigger is not user adjustable or user removable. Only the factory can adjust the trigger and assure its safety. User adjustment voids your warranty. Contact us if you would like any trigger adjustments.


Why can’t I sight in my AR-50 when I have both the 15 and 50 minute rails?

There are some variables that are out of our control that can contribute to the problem. Perhaps the scope is defective. Scopes are delicate instruments and can fail internally with no outward appearance of the problem. Also, some scopes have far less range of windage and elevation adjustment than others. If you’re just having trouble “getting on the paper”, start your zeroing at short range with a large target paper. We suggest starting at 50 yards with at least a 12” X 12” target.

Why does my AR-50 leave longitudinal marks on the fired cartridge case?

It is normal for small hair like markings to be left on the case due to the pressure of the ejector spring causing the case to hit the locking lugs during extraction. These marks are only cosmetic. They do not reduce the strength of the case.

What types of .50 cal ammo can I shoot in my AR-50?

Although the AR-50 will satisfactorily fire tracer and armor piercing ammo, such ammo can significantly reduce barrel life. Saboted ammo is not recommended because the sabot can hit the rifle’s muzzle brake, potentially damaging the rifle. See your owner’s manual for more information.

Can I adjust the trigger pull in my AR-50?

The AR-50 trigger is not user adjustable or user removable. In order to fire the large primer in .50 caliber ammo, the sear surfaces are put under high loadings. Thus, the trigger pull is set at the factory to be within safe operating limits and no further adjustments are to be made. User adjustment of the factory pre-set trigger is both unsafe and voids the warranty on the product.


My 180B is not cycling. What’s wrong?

Lubricate the rifle properly and check the gas piston. If the piston is loose, gas can escape, which causes the rifle to malfunction.


Can I re-use my existing barrel or do I have to buy a new barrel?

You can reuse your existing barrel.

Can you convert any AR-15 type firearm to an SPR Mod 1?


Can I do the conversion myself or should I have a gunsmith do the conversion?

If you buy a complete SPR MOD 1 Upper Half, the conversion is as easy as pushing out your takedown and pivot pins and replacing your current upper half with the SPR MOD 1 Upper Half. See Technical Note # 84 in the Library on our website for complete instructions on assembling an SPR MOD 1 Basic Kit to your firearm. Then you can decide for yourself if you want to tackle the project. Our custom shop will be happy to install a basic kit on your firearm. Just contact us at [email protected]

Will I need special tools to do the conversion myself?

For complete instructions (including needed tools) on installing a Basic SPR MOD 1 Kit, see Tech Note #84 in the Library on our website.

No tools at all are required to install our SPR MOD 1 Upper Half.

What sight options do I have for an SPR MOD 1?

Armalite carries a variety of backup iron sights, detachable carry handles with associated front sights, and scope mounts for our rifles. Visit our website for details. You can access them under “Accessories”, then “Detachable Sights and Mounts” on our home page.

Will the SPR Mod 1 accept any standard M4 Barrel with feedramps or does it require a special barrel?

The SPR Mod 1 is compatible with any standard M4 barrel with M4 feed ramps. Barrels with rifle-style (short) feed ramps will also fit into the receivers. But, we recommend alteration of the feed ramps to match the M4 pattern.

What type of mounting fixture does Armalite recomment for mounting the barrel?

Armalite manufactures vise jaw blocks specifically designed to safely hold the receiver in a vise. For a complete list of installation instructions and tools see Tech Note 84 in our website’s Library.

Is the SPR Mod 1 manufactured from 7075-T6 aluminum?


Does the gas tube require any special alignment?


What amount of torque is required on the barrel nut?

See Tech Note 84 for complete installation instructions.

Will Armalite offer rail protectors/heat protectors for the SPR Mod 1 rail panels?

We offer protectors as accessories. (Look under “Handguards” on our homepage.) The SPR Mod 1 kits don’t include them because many customers have preference for one of several makes of covers.

How is the SPR Mod 1 different from other manufacturers’ similar products?

The SPR Mod 1 is the only such system that allows customers to covert their exsisting carbine to Mod 1 configuration using the existing barrel because no special barrel extension is needed.

Is the SPR Mod 1 kit compatible with other calibers such as 6.8 SPC, 6mm Grendel, etc, just like any other upper receiver?