Upper Group, ENDEAVOR, Mk4, 22 ARC, 20"

5.56mm is tried and true, but 22 ARC brings 22-250 performance to the lighter-weight AR15 (Mk4) platform, and the ENDEAVORMk4 upper group with its 20barrel is sure to extract all the ballistic performance you need.Available in seven different Cerakote finishes, every ENDEAVOR Upper Group includes the bolt carrier group as well as a carefully curated selection of parts and accessories including:ZEROED AR15 Ambi Charging HandleZEROED AR15 Polymer Dust CoverZEROED Muzzle Brake 5.56mmLifetime Quality GuaranteeWe aim to please, that's why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.