Colt's Manufacturing Sporter Semi-automatic 223 Rem/556NATO 16" M4 Barrel A2 Flash Hider Chrome Lined Black Finish 4 Position Collapsible Stock 30Rd Gas Piston Four Rail Handguard LE6940P COLTA(R) LE6940P LAW ENFORCEMENT (LE) CARBINEa Semi-auto a Articulating link piston system a Designed specifically for lightweight performance speed of target acquisition & potent firepower capability a Features many combat proven advantages of the military ColtA(R) M4 a Equipped w/4-pos. collapsible stock & handguard w/dual alluminum shielding for effective heat protection a One piece flat top upper w/integral rail & BUIS a Step-cut chrome-lined full floated barrel a Includes flip-up adjustable front & rear sights flash hider bayonet lug & (1) magazine a 1:7 RH twist a Length: 32" (retracted) 35.5" (extended) a Wt.: 6.9 lbs. a Matte black finish a American Made Cal. Cap. Brl. &nThe Colt Firearms M4 Carbine 5.56MM 16-inch Quad Piston is a semi-automatic AR.223 Remington firearm with many different and highly beneficial features starting with the 4 position collapsible stock and the 4 rail hand guard M4 with flash hider. The chrome lined barrel is 16 inches. Designed for all types of hunting combat or target practice exercises. The speed target acquisition and potent firepower capabilities of this weapon are well known among gun enthusiasts. There is effective heat protection incorporated into the barrel so that it does not get overly hot during shooting.