First Look: CMMG 5.7x28 mm AR Conversion

by
posted on January 15, 2020
cmmg-inc-57x28mm-ar-conversion-magazine-upper-receiver-f.jpg
In 2020, the 5.7x28 mm cartridge is coming back in a big way, and CMMG joined multiple companies in offering a new option for fans of this high-velocity cartridge. Following up on the success of the company's Banshee chambered in 5.7x28 mm, CMMG now offers an AR-15 conversion package that allows shooters to mate their mil-spec AR-15 lower receiver with the company's 5.7x28 mm Radial Delayed Blowback upper-receiver group.

The key to this conversion lies in CMMG's 5.7 AR Conversion Magazine, which is designed to fit into standard AR-15 magazine wells while providing a reliable feed mechanism that's compatible with the company's 5.7x28 mm upper receiver. To convert any standard AR-15 to a 5.7 mm firearm, simply remove the existing upper-receiver group and replace it with a compatible, 5.7x28 mm upper receiver from CMMG. Once the upper receiver is installed, users can simply insert a CMMG 5.7 AR Conversion Magazine into the mil-spec magazine well.

In addition to allowing AR owners to experiment with the 5.7x28 mm cartridge without having to purchase an entirely new firearm, this CMMG conversion system maintains the controls and configuration of any existing AR-15 lower. If users have an enhanced trigger installed in their gun or optimized controls, they can continue using those components without having to invest in or learn an entirely new firearm. CMMG recommends the use of a standard carbine buffer and action spring to run the 5.7x28 mm conversion reliably, and the magazine provides last-round bolt hold-open capability.

A complete lineup of CMMG Banshee and Resolute upper receivers are compatible with the 5.7 AR Conversion Magazine. CMMG's Mk57 upper receivers can be had in 5", 8" and 16" barrel lengths, and the uppers ship complete with bolt-carrier group and charging handle. A single CMMG 5.7 AR Conversion Magazine holds 40 rounds of 5.7x28 mm, and the suggested retail price on the mag is $39.95. Suggested retail pricing on the Mk57 upper receiver complete with three 40-round magazines starts at $799.95. For more information on these conversion kits, visit cmmginc.com.


Latest

man shooting bergara rifle outdoors
man shooting bergara rifle outdoors

Trend-Setting Precision: Manufacturer-Run Long-Range Clinics

A quiet trend has begun in firearm industry and, judging by the response, the approach could quickly spread. While more and more gun companies are holding highly successful free events that provide fans a chance to take their latest models for a short “test drive” at a range, a pair of precision-rifle companies have launched something very different.

Review: CMMG Banshee Mk10 Pistol

CMMG offers its radial delayed blowback action Banshee line of large-format pistols based off the AR-15 in a 10 mm Auto chambering as well, with the Banshee Mk10.

NRA Gun Of The Week: Franchi Affinity Turkey Elite

Watch American Rifleman staff on the range this week with the Franchi USA Affinity Turkey Elite in 20 gauge, a package designed for the pursuit of wild turkey.

The Armed Citizen® Sept. 23, 2022

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

Preview: Skeeter Hawk Mosquito Repellents

Skeeter Hawk’s mosquito-repelling products make use of all-natural essential oils instead of harsh chemicals to help keep the flying insects away.

Springfield Launches New Online Shopping Experience

The revamped and enhanced experience is designed to ensure customers find exactly what they want quickly—and for a great price.

Interests



Get the best of American Rifleman delivered to your inbox.