The PMAG Minus 10 Round Limiter installs in 20 or 25 round 7.62×51 LR/SR GEN M3 PMAG bodies, reducing the magazine capacity by ten rounds. Designed for sporting and hunting applications, installation of the Limiter is simple, tool-less, and requires no permanent modification of the magazine body. This will NOT make a banned magazine legal! This product is intended for TEMPORARY capacity reduction of PMAG LR/SR GEN M3 magazines.