M-15™A4 Complete Upper Receiver Assembly
Complete upper receivers include: M-15 port door assembly (EU0370), M-15 port door rod (EU0340), AR-10 / M-15 port door spring (EA1167), M-15 forward assist (EU0460), and forward assist spring (EU0480).
5.56 mm NATO / .223
M-15 A4 flattop upper receiver, 7075-T6 aluminum. Thread Size: 1 – ¼” x 18 UNF-3A
Hard anodized aluminum, manganese phosphate steel
10% of all sales donated to Team Rubicon's Hurricane Harvey relief efforts until Sept. 30th.