CMMG 60AE90CAB: Designed to deliver phenomenal ballistics from an AR15 platform that rivals the performance of rounds like .243Win or .308Win in larger rifles. The 6mm ARC (Advanced Rifle Cartridge) is perfect for anyone looking for a lighter weight rifle that doesn\'t lose out on long-range performance. With features like the Jmac Customs padded folding stock 2-stage trigger and Zeroe accessories this Dissen is a flat shooter that\'s sized and ready to go where you need to. - Hosting an array of Zeroed parts and accessories the Dissent builds on the renowned AR15 manual of arms and is available in a variety of custom Cerakote finish options. The rear of this Dissent features a 1913 Picatinny rail end plate that allows for the attachment of accessories like sling mounts folding stocks and more. - Platform Mk4 - Caliber 6mm ARC - Operating System Direct Impingement - Barrel Length 16.1 - Barrel Twist 1:7.5 - Barrel Contour MT - Barrel Material 416SS SBN - Barrel Twist 1:7.5 - Muzzle Device CMMG Zeroed Muzzle Brake - Muzzle Thread 5/8 x 24 - Gas Port Location Rifle - Gas Block Adjustable 0.750 - Upper Receiver Dissent 7075 T6 Aluminum - Lower Receiver Mk4 Forged 7075 T6 Aluminum - Hand Guard CMMG 15 Proprietary - Finish Cerakote - Charging Handle Dissent Side Charger Reversible - Pistol Grip CMMG Zeroed Pistol Grip - Receiver Extension 1913 Picatinny Rail End Cap - Trigger Type Zeroed Drop-In - Trigger Guard CMMG Zeroed Trigger Guard - Safety Selector CMMG Zeroed 60/90 Degree - Magazine CMMG 10rd (2) - Weight 6.4 lbs - Length 26.3