8.6 BLK the round that gives you more rifle with less barrel. Thanks to the quick 1:3 twist rate 8.6 BLK hits it full ballistic potential with a much shorter overall barrel length compared to its AR10 contemporaries. If you're a fan of hunting suppressed then this is definitely the round for you grab your new 8.6 BLK RESOLUTE suppressor and subsonic ammo and show those 300 BLK fans what stopping power means. - Platform Mk3 - Caliber 8.6 BLK - Operating System Direct Impingement - Barrel Length 16.1 - Barrel Twist 1:3 - Barrel Contour MT - Barrel Material 4140CM Nitride Finish - Barrel Twist 1:3 - Muzzle Device CMMG ZEROED Muzzle Brake - Muzzle Thread 5/8 x 24 - Gas Port Location Carbine - Gas Block Adjustable 0.750 - Upper Receiver Billet 7075 T6 Aluminum - Lower Receiver Mk3 Billet 7075 T6 Aluminum - Hand Guard CMMG EML15 M-LOK - Finish Cerakote - Charging Handle CMMG ZEROED Ambi - Pistol Grip CMMG ZEROED Pistol Grip - Buffer Type Carbine Mk3 - Receiver Extension CMMG 6 Position Fastback w/Ambi Sling Plate - Stock / Brace CMMG RipStock - Trigger Type ZEROED Drop-In Single Stage - Trigger Guard Integrated - Safety Selector CMMG ZEROED 60/90 Degree - Magazine Magpul 20rd PMAG - Weight 8 lbs - Length 34