This extension replaces the magazine floor plate adding two rounds capacity to Glock factory M20 45ACP and M21 10mm magazines. This unit is for use on high capacity M20 and M21 magazines only, it will not work on the 10 round magazines. Not for use on Glock M30 magazines.
These units alter the capacity of M20 and M21 high capacity magazines
These units will work on Full Metal and Non Full Metal lined magazines
They are made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 350 F.
Rockwell Arms stocks some of its firearms in its Sandpoint, Idaho store, but some firearms shown on the site will not be in stock in the store. If you would like to buy a particular firearm from the store, please call ahead to confirm it is in stock in the store.