20in 1/7 twist stainless steel barrel. Davidson Defense Uintah "Drop-In" Trigger. CO-83894 Sound Mitigation Mil-Spec Buffer Tube Kit Fea-turing: Armaspec Sound Miti-gation Buffer - H Gen3. Tanker Style 2 Port SS Muzzle Brake. AR-15 Ambidextrous "Holy" Charging Handle.