Bushmaster Firearms Int.Llc. Ar-15 5.56 16″ M4 Upper Kit

We
Bushmaster M4 Upper Receiver Kit, ready to complete your build. Kit includes fully assembled upper receiver, bolt carrier group, handguards, charging handle and detachable carry handle. Upper features a 16″ M4 barrel which is machined from 4140 chrome moly steel, chrome lined, has a 1-9 twist, has a front sight base installed on a .750″ barrel shoulder, 1/2-28 muzzle threads and an A2 flash hider installed. Upper receiver has M4 feed ramps, as well as a detachable carry with rear sight. Included complete bolt carrier group has a matte black phosphate finish, is chrome lined and is magnetic particle inspected. Mfg: Bushmaster Firearms Int.Llc. SPECS: Fits – AR-15 lower receivers.