The Colt M4 Midlength Carbine Rifle is a semi-automatic, direct gas impingement rifle chambered in 5.56mm NATO, uniquely engineered as the only model in Colt's core lineup to feature a smooth-cycling, mid-length gas system. This modern sporting rifle incorporates a 16.1-inch chrome-lined, medium taper profile barrel with a 1:7" right-hand twist rate and a standard A2 flash hider, optimized to cut down overall front-end weight without sacrificing match accuracy. It is built on mil-spec forged 7075-T6 aluminum upper and lower receivers finished in a matte black hardcoat anodizing, topped with an optics-ready flat-top Picatinny upper receiver. The tactical layout features a premium, free-floating aluminum Centurion Arms M-LOK handguard that provides an extended attachment rail while isolating the barrel from hand pressure. The duty-ready configuration is completed by standard mil-spec polymer furniture, including an A2 pistol grip, a single-stage trigger, a manual thumb safety selector, and a 6-position adjustable collapsible M4-style buttstock. The rifle weighs an exceptionally maneuverable 5.95 pounds unloaded and feeds from an included 30-round magazine. Colt M4 Carbine Midlength 5.56mm 16.1" Bbl Midlength Gas System Semi-Auto Matte Black Rifle CR6960