CMMG Endeavor 20" Upper .22 ARC with 1:7 Twist Rate and M-LOK Rail – Rifle-Length with BCG and CH – Midnight Bronze – 28B3D0CMB

While 5.56x45mm remains a proven choice, the .22 ARC introduces the potent performance of the 22-250 caliber to the lighter-weight AR-15 (MK4) platform. The ENDEAVOR MK4 upper group, featuring a 20 inches barrel, ensures optimal ballistic performance for your needs. Each ENDEAVOR upper group comes complete with a bolt carrier group and a thoughtfully selected range of parts and accessories, delivering comprehensive functionality and customization options.