CMMG now uses +0.002" Head Space gauges which is the new industry standard. Customers trying to use standard gauges will find they do not check correctly.

Mk4 Tactical

The Mk4 T or Tactical Upper sets itself apart being equipped with the new RKM11 KeyMod free floating hand guard, a lightweight, low profile alternative to quad rails with even greater modularity. Available with a bead blasted matte finish, 416 stainless steel, 16” barrel and A2 compensator.

Caliber: 300 BLK

Barrel: 16” medium weight tapered profile Bead Blasted 416 SS 1:7”

Muzzle: A 2 comp., threaded 5/8-24(300 BLK)

Hand Guard: CMMG RKM11 KeyMod hand guard

Upper Rcvr: Forged 7075 T-6 AL M4 type



CCMG Mk4 T, 300 BLK Upper Group

SKU: 30BC353