Colt CR6920 Magpul Carbine 5.56mm NATO 16in Matte Black Semi Automatic Modern Sporting Rifle - 30+1 Rounds - This Semi-Automatic Colt Carbine is the standard by which all Modern Sporting Rifles and Law Enforcement Carbines are judged. It features a fixed A2 front sight and Magpul MBUS rear sight, a barrel with grenade launcher cutout, dual heatshield handguards, flat top upper receiver, and buttstock which define this modern classic. Heat Shield Handguards; 7075 T6 Aluminum Receivers; Single Stage Trigger; 4150 Chrome Moly Vanadium Barrel;