Hard polymer insert snaps into the floorplate to limit capacity for sporting or hunting applications. Installs easily without tools and requires no permanent alteration of the magazine. Will not make a banned magazine legal, as capacity reduction is not permanent. Minus 10 reduces capacity by 10 rounds. Mfg: Magpul SPECS: Reinforced molded hard polymer, black. Sold in paks of 3. 7.62 Minus 10 fits 20- and 25-rd mags.