CMMG UPPER GROUP, ENDEAVOR, Mk4, 5.56x45MM NATO, 18″

UPPER GROUP, ENDEAVOR, Mk4, 5.56x45MM NATO, 18″

For those looking to reach out further with 5.56mm, the ENDEAVOR® Mk4 Upper Group is here. Perfect for new builds or for use with an existing AR15 lower receiver, this upper utilizes an 18” 416 stainless steel barrel with a nitride finish for enhanced ballistic performance and superior durability.

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 Handle

ZEROED AR15 Polymer Dust Cover

ZEROED Muzzle Brake 5.56mm

Lifetime Quality Guarantee

We aim to please, that’s why every CMMG product is backed by our Lifetime Quality Guarantee against material and workmanship defects. Learn More.