Brownells BRN XM177E2 Complete Upper Receiver 5.56 NATO 11.5" Lightweight

The Brownells BRN XM177E2 is a complete AR-15 upper receiver kit chambered in 5.56 NATO, built around an 11.5" lightweight-profile barrel. The barrel features a 1:12 twist rate and a phosphate finish, consistent with the original Vietnam-era XM177E2 specification. The muzzle is threaded 1/2-28, compatible with standard 5.56 muzzle devices. The XM177E2 configuration uses a carbine-length gas system appropriate to the 11.5" barrel. This upper is finished in black phosphate throughout, faithfully recreating the classic Colt Commando silhouette as a complete, ready-to-install assembly.