This is a new Colt Manufacturing M4 Carbine CM5-Sentry semi-automatic rifle chambered in 5.56 NATO (.223 Remington). This rifle features a 16-inch chrome lined barrel, A2 birdcage flash hider, 1:7” rate of twist, Aluminum construction, free float M-LOK handguard, full length picatinny rail for optic mounting, low profile flip up adjustable sights, ambidextrous controls, single stage trigger, direct gas impingement operating system, polymer grip, and a Magpul CTR 4-position adjustable stock. This rifle ships in its factory box with one polymer Magpul PMAG 30-rount magazine,owner’s manual, and a lock. The manufacturer part number is CM556-16-M5S.