New: CMMG 5.7x28mm to .22 LR Conversion Kit

by
posted on August 25, 2020
** When you buy products through the links on our site, we may earn a commission that supports NRA's mission to protect, preserve and defend the Second Amendment. **
new-project.png (2)

CMMG has expanded its lineup with the addition of the Mk57 .22 LR AR Conversion Kit. Now, you can transform a CMMG 5.7x28mm upper receiver group into a .22 LR by swapping the bolt-carrier group and pairing with an AR-15/Mk4 lower receiver. Add in a dedicated CMMG .22 LR magazine, and you are ready to shoot rimfire.

The Mk57 .22 LR Conversion Kit is designed to be used with all existing CMMG Mk57 5.7x28mm upper receiver groups and bolt/barrel combinations, when paired with any AR-15/Mk4 lower receiver. Plus, no tools are required for installation.

Each kit includes the new .22 LR bolt-carrier group, and the choice of one or three 25-round magazines. In addition, CMMG has Mk57 5.7x28mm complete uppers available, in 5-, 8- and 16-inch barrel lengths.

MSRP ranges from $199.95 to $229.95, depending on the how many magazines you choose to purchase. Something to note, this kit is not compatible with Mk57 lower receiver groups or 5.56mm/.223 Rem. uppers. Learn more at cmmginc.com.


See more: Review: CMMG Resolute Mk4 PCC 9mm

Latest

2025 Lapuacup 1
2025 Lapuacup 1

Marsh Edges Stine In Canadian Showdown To Win Lapua Monarch Cup Opener

Justin Marsh edges Jake Stine by one point to win the Canadian NRA Smallbore Silhouette Nationals and first stage of the 2025 Lapua Monarch Cup.

Hitting The Bullseye: England’s Bideford Shooting Club’s Big Dream Needs You

Bideford Target Shooting Club in the U.K. launches fundraising drive to build world-class shooting facilities for all ages and abilities.

Silencer Central CEO Brandon Maddox Joins NSSF Board Of Governors

Silencer Central CEO Brandon Maddox appointed to NSSF Board of Governors.

Nicholas Coppage Tops Field At 2025 USA High School Clay Target Nationals

Nicholas Coppage wins 2025 national clay target title after a perfect final round and epic shoot-off, Beaver River Central H.S. receives team title.

New: Metal Madness Easy Up Target Frames

A simpler setup with more affordable gear makes Metal Madness steel shooting more accessible than ever.

NRA Announces Dianna & Ryan Muller As Brand Ambassadors For America’s Rifle Challenge

NRA announces Dianna & Ryan Muller as brand ambassadors for America’s Rifle Challenge program, promoting AR-15 marksmanship, safety and training.

Interests



Get the best of Shooting Sports USA delivered to your inbox.