This is an awesome rifle. Long stroke piston system, 3 setting adjustable gas system. Amazing with a suppressor. And a wild muzzle break. Ive never had a malfunction jam or anything just an amazing upper. Only selling cause i dont have silencers yet, this is my safe queen and someone else will use it more. Lil BCM grip I will trade for a something from Q Radian Raptor LT charging handle.