ArmaLite Inc Upper Receiver M15A4 Assembly .223 Caliber /5.56MM

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).



- Caliber: 5.56 mm NATO / .223

- Upper Receiver: M-15 A4 flattop upper receiver, 7075-T6 aluminum. Thread Size: 1 – ¼” x 18 UNF-3A

- Finish: Hard anodized aluminum, manganese phosphate steel

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