Built around the .308 cartridge the CMMG� Mk3 platform is the larger frame foundation for cartridges such as .308 Win. Material selection is key to a quality rifle which is why the barrel on this .308 ENDEAVOR is made from 416 stainless steel with a nitride finish for durability and corrosion resistance without sacrificing performance. - Platform Mk3 - Caliber .308 WIN - Operating System Compact Action-Direct Impingement - Barrel Length 16.1 - Barrel Twist 1:10 - Barrel Contour MT - Barrel Material 4140CM Nitride Finish - Barrel Twist 1:10 - Muzzle Device CMMG ZEROED Muzzle Brake - Muzzle Thread 5/8 x 24 - Gas Port Location Rifle - Gas Block Adjustable 0.750 - Upper Receiver DISSENT Mk3 7075 T6 Alumunium - Lower Receiver Mk3 Billet 7075 T6 Aluminum - Hand Guard CMMG 15 Proprietary - Finish Cerakote - Charging Handle Dissent Side Charger Reversible - Pistol Grip CMMG ZEROED Pistol Grip - Receiver Extension DISSENT Folding Stock Adapter - Stock / Brace DISSENT Side Folding Stock - Trigger Type ZEROED Drop-In Single Stage - Trigger Guard Integrated - Safety Selector CMMG ZEROED 60/90 Degree - Magazine (2) Magpul 20rd PMAG LR/SR - Weight 8.5 lbs - Length 34.6-37.6 (28.2 Folded)