CMMG Upper Group, Mk4, A4, 22LR
The classic AR-15 Upper Group configuration, based on the M16A4, is available in both 5.56x45mm NATO and 22LR. The Mk4 A4 Upper Group’s defining characteristic is its 20" government profile barrel. The 22LR features a premium 4140 CrMo steel barrel with a nitride finish for years of accurate shooting and reliable performance.
Features and Specifications:
Manufacturer Number: 22B6A72
Caliber: 22LR
Barrel: 20", 1:16 twist, government profile, 4140 CrMo, SBN
Muzzle: A2 compensator, threaded 1/2-28
Hand Guard: M4 type 2 piece hand guards
Receivers: Forged 7075-T6 AL M4 type upper
The classic AR-15 Upper Group configuration, based on the M16A4, is available in both 5.56x45mm NATO and 22LR. The Mk4 A4 Upper Group’s defining characteristic is its 20" government profile barrel. The 22LR features a premium 4140 CrMo steel barrel with a nitride finish for years of accurate shooting and reliable performance.
Features and Specifications:
Manufacturer Number: 22B6A72
Caliber: 22LR
Barrel: 20", 1:16 twist, government profile, 4140 CrMo, SBN
Muzzle: A2 compensator, threaded 1/2-28
Hand Guard: M4 type 2 piece hand guards
Receivers: Forged 7075-T6 AL M4 type upper