Pearce Grip PG1045+ Magazine Extension made of Polymer with Black Finish for Glock 20 21 29 40 41 Gen4 with High Capacity Magazines Only (Adds 2rds)

This extension replaces the magazine floor plate adding two rounds capacity to Glock factory M20 M21 M29 M40 and M41 magazines. This unit is for use on high capacity magazines only it will not work on the 10 round M20 and M21 magazines. Not for use on Glock M30 10 round magazines.