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The CMMG Mk57 .22LR Kit allows for easy conversion of your 5.7x28mm upper receiver group to shoot .22LR.
Simply remove the BCG from your CMMG 5.7 upper and replace with the drop-in conversion. This kit is designed for the CMMG Mk57 5.7x28mm upper receiver groups and bolt/barrel combinations when used with an AR15 lower.
**THIS KIT IS FOR CONVERTING 5.7X28MM TO 22LR ON CMMG 5.7 CONVERSION UPPERS ONLY AND WILL NOT WORK WITH .223/5.56 CHAMBERED RIFLES OR MK57 LOWER**
Not compatible with Mk57 Lower Groups or 5.56/.223 uppers.
5.7×28 to 22lr conversion
Three 25rd Magazines
Stainless Steel Construction
Compatible with all CMMG Mk57 Uppers
Magazine Fits in Mil-Spec AR15/Mk4 lowers
Simple Installation — No Tools Required
* Magazine(s) are not included for Restricted States.
Magazine capacities are regulated in many states and jurisdictions. Please understand your local laws prior to ordering. Click here for detailed information on magazine capacity restrictions .