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