CMMG® Unveils the First 5.7x28mm to .22LR Conversion Kit
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Boonville, MO – CMMG® expands on the popular .22LR Conversion Kit with the addition of the Mk57 .22LR AR Conversion Kit. Easily convert your CMMG 5.7x28mm upper receiver group into a .22LR by swapping the bolt-carrier group, paired with the 5.7x28mm upper