Colt M4 Carbine OEM1 No Furniture 5.56mm NATO 16.1in Black Semi Automatic Modern Sporting Rifle - 30+1 Rounds - The Colt OEM Series offers a no-compromise solution for consumers and dealers to build and offer customized rifles based on the proven Colt M4Platform. Handguards, Buttstock, Trigger Guard, Magazine, and Rear Sight have been omitted completely. The OEM1is ready to accept most aftermarket Drop-In style Handguards that utilize the factorybarrel nut and retaining ring. Pistol Grip Muzzle Brake Chrome-Lined Barrel 16in To 17.99in Barrel Length Range