The AR 15 build for an
AR 15 pistol comprises of two parts namely the upper receiver and the lower receiver. The upper receiver parts comprises of the stripped upper receiver, barrel, muzzle device. gas tube, gas block, hand-guard, charging handles, bolt carrier group, forward assist and the dust cover. In similar terms, the lower receiver parts comprises of the following such as the stripped lower receiver, pistol grip, lower parts kit, optional upgraded trigger, buffer system, and finally the stock or the pistol grace.