FN SRP G2H AR-15 Complete Upper Receiver with 5.56x45mm NATO 18 Barrel. FN upper assemblies are built in FN's Columbia, SC facility alongside US Military contract M4 rifles. Includes an M16-style bolt carrier assembly with staked gas key and Carpenter 158 MPI bolt, charging handle and a cold hammer-forged barrel. Features a lightweight aluminum free-float handguard, Mil-Spec charging handle, Picatinny rail on top of the receiver, and 5 QD sling points on the handguard.