This is the complete M4 Barreled Upper Assembly from our 7.62 x 39mm SRC rifle. Its 16″ M4 profile barrel is chrome lined and machined from 4150 Chrome Moly Vanadium 11595E Steel – rifled 1 x 9.5″ Right Hand twist – includes a set of M4 dual heat shield Handguards, and an A2 Flash Suppressor (threaded 5/8 x 24). A Mil. Std. 1913 Railed Front Sight Base/Gas Block with sling swivel allows the attachment of a variety of Front Sights. The machined aluminum flat top Upper Receiver is complete with 7.62 x 39mm Bolt Carrier Assembly, Charging Handle, Forward Assist, and Ejection Port Cover.