Armalite upper receiver m15a4 assembly.223 cal /5.56mm
FEATURES: -Includes: M-15 port door assembly, M-15 port door rod, AR-10/M-15 port door spring, M-15 forward assist & forward assist spring
Other Features: Includes: m-15 port door assembly, m-15 port door rod ar-10 / m-15 port door spring m-15 forward assist and spring m-15 flattop upper receiver
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