Built with easy modularity and exceptional performance, CMMG's Mk9 T 9mm Upper Group delivers both at an affordable price. CMMG's RKM-series KeyMod free-floating handguard protects hands from hot metal. The 16.1" barrel is crafted of nitrided 4140 chromoly steel with an accuracy-enhancing 1:10 twist. Muzzle features a removable A2 compensator attached with 1/2"-36 threading. Forged 7075-T6 aluminum M4-type upper receiver. Made in USA.