Rock River Arms Tactical Carbine Complete Upper Receiver 450 Bushmaster 16" Mid-Length, Black Anodized - 450B0592

This Rock River Arms complete upper receiver is chambered in 450 Bushmaster with a 16" barrel and mid-length gas system, designed for AR-15 platforms. The assembly includes a bolt carrier group, charging handle, RRA Operator muzzle brake, and 13" free float M-LOK handguard with anodized black finish. Ships with one 5-round magazine and requires only a lower receiver and stock assembly for a complete rifle.