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New Kid on the Block: CMMG’s Mk4, 22 Nosler Rifle

By Thomas Murphy, Photography by Jim Grant

The Company

CMMG was established 15 years ago, in 2002, by the Overstreet family—John, Jeff, Gretchen and Stephanie. Located in Fayette, Missouri, it is a leading manufacturer of AR rifles and related parts. Today, it manufactures over six different rifle and carbine versions of the AR platform. Calibers range from the 9mm pistol cartridge, through the .458 SOCOM, 7.62x39mm, 5.56 NATO, .300 Blackout and the powerful .308 Winchester. There are even five firearms chambered in .22 Long Rifle.

They produce all the parts needed to build an AR-type firearm. All of their products either meet or exceed original MIL-SPEC standards. They specialize in 22LR conversion kits for the AR that consist of either a 10- or 20-round magazine, .22LR bolt, forward assist adaptor, anti-jam charging handle and cleaning rod and jag.

CMMG even stocks provisions. The one that most interested this writer is “Tactical Bacon.” Yes, it’s bacon. Fifty-four slices of fully-cooked, ready-to-eat bacon in every CMMG-marked can.

The Mk4 V2, 22 Nosler

CMMG has come up with a new rifle—the MK4 V2 in 22 Nosler. It is unlike any of their other offerings, in that it’s chambered for the 22 Nosler cartridge. The AR-type upper and lower receivers are forged 7075-T6 aluminum. This aluminum alloy is very strong, with strength comparable to many steels. Its primary alloying element is zinc. This alloy has lower resistance to corrosion than many of the other aluminum alloys, but it is still very good; its composition is zinc, magnesium, copper and less than one percent of silicon, iron, magnesium, titanium and chromium. The T-6 temper has an ultimate tensile strength of 74,000–78,000 psi. There are four distinct models chambered for the 22 Nosler.

A 24-inch medium-taper fluted barrel is manufactured from 416 stainless steel, which is highly resistant to acid, alkali and fresh water. The tapered barrel is optimized for strength and weight. The muzzle has a step-down target crown. Its primary purpose is to provide propellant gasses a resistance-free path from all parts of the projectile as it exits the bore. Also, it...

This article first appeared in Small Arms Review V21N10 (December 2017)
and was posted online on October 20, 2017

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