The AR-15 receiver is made up of two parts in its design. There is the upper receiver and the lower receiver, each which control critical functions of the AR-15. The upper assembly is a completed upper receiver which includes all the components necessary to cycle the action.
The AR-15 receiver is made up of two parts in its design. There is the upper receiver and the lower receiver, each which control critical functions of the AR-15. The upper assembly is a completed upper receiver which includes all the components necessary to cycle the action.
