If you want to deliver a hard hitting round at long-range and still have a well-balanced rifle when walking through the field the 20-inch ENDEAVOR� Mk3 in .308 WIN is a prime candidate for the job. Trusted for decades by hunters and marksmen alike .308 WIN delivers excellent results up close and at extended distances and can pack quite a punch. - Carrying on the AR15's reputation for modularity CMMG� builds our larger caliber rifles like .308 WIN & 6.5 Creedmoor on our Mk3 (AR-10) size platform which is based on the LR-308/DPMS Gen 1 high-pattern design. - Each CMMG ENDEAVOR rifle is purpose-built for long-range performance with everything from the Magpul� MOE� rifle stock to the ZEROED muzzle brake and every part in between selected for its utility to the avid marksman. - The EML 15 handguard maximizes customization potential. M-LOK� attachment slots at the 12 3 6 and 9 o'clock positions give you plenty of real estate to mount accessories while the Picatinny rail sections allow for easy and solid mounting points for sights and accessories. - Platform Mk3 - Caliber .308 WIN - Operating System Direct Impingement - Barrel Length 20 - Barrel Twist 1:10 - Barrel Contour MT - Barrel Material 416SS SBN - Barrel Twist 1:10 - Muzzle Device CMMG ZEROED Muzzle Brake - Muzzle Thread 5/8 x 24 - Gas Port Location Rifle - Gas Block 0.750 Non-Adjustable - 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 Rifle Mk3/A1 - Receiver Extension A1 - Stock / Brace Magpul MOE Rifle Stock - Trigger Type ZEROED Drop-In - Trigger Guard Integrated - Safety Selector CMMG ZEROED 60/90 Degree - Magazine Magpul 20rd PMAG - Weight 8.8 lbs - Length 41.2