CMMG Adds 5.56mm Caliber to New AR Pistol Line-Up

CMMG has added a 5.56mm chambering to its recently released line-up of Mk4 K AR Pistols.


Aside from the caliber, the most notable difference in this new Mk4 K AR Pistol in 5.56mm is that it features a 12.5-inch barrel, compared to the 8.2-inch barrel found on the .300 AAC Blackout and 9mm versions.

The company says the increased barrel length will allow shooters to attain greater accuracy and reliability with the popular 5.56mm cartridge.

The Mk4 K AR Pistol comes with a Magpul MOE pistol grip and stock, an A2 muzzle compensator and features an ambidextrous rear sling mount.

Other features include CMMGs RKM11 free-floating KeyMod hand guard. The KeyMod slots are located at the 3, 6 and 9 oclock positions and allow users to mount compatible accessories directly to the hand guard.

For accessories that are not yet compatible with the KeyMod system, CMMG offers separate 5-slot rails that attach to the hand guard. For mounting sights or optics, a 1913 Picatinny rail runs across the top of the firearm.

CMMG AR Pistol Specifications

Caliber 5.56mm

Barrel 12.5″ medium weight, 1:7″ twist

Muzzle A2 Compensator

Hand Guard CMMG RKM11 Free-Float KeyMod hand guard

Receiver Forged 7075-T6 AL

Trigger Single Stage Mil-Spec Type

Furniture Magpul MOE Pistol Grip

Weight Unloaded 5.3 lbs.

Length 28″

Magazine 30-round PMAG

MSRPs $1,049.95

Do you own an AR-style pistol? If so, tell us about it in the comments section.


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