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CMMG, Inc 22LR AR Conversion kit, Mk57, 10rd
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product review

by doesnt matter, Verified Owner from KY, United States Written on March 21, 2026
Conversion kit works well. Just wish the mag held more than 10 rounds
Would recommend: Yes
Was it helpful to you? Yes | No

Very fun but needs break-in

by Geof Wickett, from CA, United States Written on February 24, 2022
I have only used it once so with about 100 rounds. I’m using mini mags but it jambs a lot. It was starting to get better towards the end. But probably needs another 100 to work well. I am hoping it does get better when it cycles it is a lot of fun to shoot.
Pros:
  • Cheep to shoot your AR
Cons:
  • None
Best Used for:
  • plinking
  • Varment
Would recommend: Yes
Was it helpful to you? Yes | No

Plinking on the cheap

by Bruce, from PA, United States Written on May 14, 2021
This is awesome. I bought this item and took it to the range. 50 rounds of 22LR not a single misstep. I swapped the bolt carrier on the range bench jammed in my 5.56 Mag and shot those down range. Awesome product, highly recommend.
Pros:
  • Easy to install
  • Works as advertised
  • saves $ on ammo
Cons:
  • Bolt doesn't lock back after last round.
Best Used for:
  • target practice
Would recommend: Yes
Was it helpful to you? Yes | No
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