7.62x51 and 5.56x45
Caliber Conversions Kits

Change calibers by swapping out 3 simple component groups.

Convert the MM23E or MM23EK from 5.56x45 to 7.62x51.
Convert the MM21E or MM21EK from 7.62x51 to 5.56x45.
Barrel Group
Bolt Group
Feed Box Group

Call To Order Or For Product Information
(618) 570-8641