CMMG Endeavor 20" Upper .22 ARC with 1:7 Twist Rate and M-LOK Rail – Rifle-Length with BCG and CH – Charcoal Green – 28B3D0CCG

While 5.56x45mm remains a trusted standard, the .22 ARC introduces the high-performance capabilities of the 22-250 caliber to the lightweight AR-15 (MK4) platform. The ENDEAVOR MK4 upper group, featuring a 20 inches barrel, is designed to fully leverage ballistic potential. Each ENDEAVOR upper group includes the essential bolt carrier group and a meticulously chosen assortment of parts and accessories.