This is the complete M4 Barreled Upper Assembly from our unique “SRC” rifle. Its tack-driving 16” M4 profile barrel is chrome lined and machined from 4150 Chrome Moly Vanadium steel – rifled 1 x 9” Right Hand twist – includes an A2 Flash Suppressor. A Picatinny Rail gas block with sling swivel allows the attachment of a variety of Front Sights. M4 dual heat shield Handguards complete the barrel. The machined aluminum flat top Upper Receiver is complete with Bolt Carrier Assembly, Charging Handle, Forward Assist, and Ejection Port Cover.