this Upper fits the std ar-15 lower with small pins, has been used for deer hunting only, it has been fired about 125 times with 115 noslers. they shot well on my reciever. 22" barrel ss 1-10 twist, bolt carrier group. rifle with m4 stock weighrd 7.5 pounds minus scope. comes with Lee dies and 98 cases, most fired once. 750.00 tyd.