CMMG Introduces Mk57 .22LR Conversion Kit

The Heretic · Sep 5, 2020

CMMG Introduces Mk57 .22LR Conversion Kit -

Do you own a CMMG 5.7x28mm upper? Are you a bit tired of sourcing that kind of caliber, but still want to shoot your gun? Now CMMG has added a .22LR conversion kit, so you can enjoy shooting it with .22LR at a reduced cost.

www.thefirearmblog.com

Ironbar · Sep 5, 2020

I did a review of this unit a while back. I was not happy with it. It's worthless IMO as it is inaccurate. No two rounds will land in the same spot no matter what ammo you're using. I'll likely throw mine away as a bad investment.

spookshack · Sep 5, 2020

Damn! That sucks....

Dirty Cary · Sep 5, 2020

I have the 556 version have 800 rounds through it only a couple malfunctions, and accuracy was fine. As accurate as my 10/22.

Alexx1401 · Sep 5, 2020

Ironbar said:
I did a review of this unit a while back. I was not happy with it. It's worthless IMO as it is inaccurate. No two rounds will land in the same spot no matter what ammo you're using. I'll likely throw mine away as a bad investment.

Damn shame. Do they suffer from the wrong twist as in the conversions for an AR in .223?

Ironbar · Sep 6, 2020

I'm sure the twist affects accuracy. It never malfunctioned on me, but it also never landed rounds on target either. Guess you really just need a dedicated 22 upper for that. I tried six different types of 22 ammo through that thing and the result was the same. Damn shame for sure. I was hoping it was going to be accurate so I could use it at Appleseed.