Search: Psa M16a4 Lower. 8 rifles, PSA 20" M16A4 clone Remington 870, Remington 700VTR SA XDm9, XDm9C, , XD9SC S&W 1911 Ruger GP100, Hawkeye77 Compact 6 Second, the kit will have a buffer detent and a buffer detent spring 56 Carbine, S&W M&P10 PSA Lower/BCM LW 16" middie CHF upper PSA Lower/BCM LW 14 manufacturer of quality tactical. From Retro Rifles - XM16E1 (1964-67) or M16A1 (1967-mid 80's) Upper receiver, Barrel and Fro. $930.00. Add to Cart. Quick view Retro Rifles. C7 / C8 / M16A1E1 Upper Receiver. C7 (M16A1E1) Upper Receiver. This was a "transitional" model since it had a Shell Deflector for left. Colt M16 Upper Receiver Group, complete re-issue This is a Charlie's exclusive. The complete M16A1 upper receiver from Colt's M16 reissue collector series. Factory new. Some handling marks are normal for anything Colt. M16A1 upper receiver; Barrel Length: 20" Rifle gas system; Barrel Twist: 1:12; Chrome-Moly Vanadium, Phosphated Steel barrel. The M16A4 has some quality specs behind it and it has a notable change from the chrome lined mil ... Upper : Standard M4 Upper Receiver ; Barrel: 20″ 5.56 NATO, Rifle Length, 1:7 ... A2 Style Handguard, Rifle Length; Gas System: Rifle Length Gas System; Bolt Carrier Group: M16 Cut, 8620 Steel, Phosphate Finish, Properly Staked, Carpenter 158. m16 604 style upper in black with 1:9 twist barrel ... original colt m16a1 parts kit in good condition $ 979.99 read more; reproduction xm177e2 upper in black. rated 5.00 out of 5 $ 899.99 read more; cart. product categories. retro rifle & service rifle parts. m16 & m16a1 parts ... lower receivers; magazines; pistol grips; sights & scope mounts.