LWRC International is one of the leading developers of the short stroke Gas Piston system for the AR-15 rifle. If you are looking for the accuracy of the AR with the reliability of a piston system then this is your rifle. The Barrel is 16" Cold Hammer Forged Barrel with a 1:7 twist rate designed to stabilize heavy grain bullets. The LWRC M6 IC SPR rifle also features the Magpul MIAD Pistol Grip, LWRC Back Up Iron Sights, and the LWRC Extended SPR Hand Guard. Mfg: Lwrc International