Grip Extension For GLOCK 29/30(9rnd)/20/21/40/41 This extension replaces the magazine floor plate adding 1" in grip length to Glock factory M20,M21,M29,M40 and M41 magazines. This does not alter the capacity of the magazine. This unit works on all 10mm and 45ACP Magazines except 10 round Glock 30 magazines. Approximately 1/2" longer than the PG-29 grip extension. These units will work on third, fourth and fifth generation Glock models If you need this extension installed on a factory specific magazine check out the PARTS+MAG section for current availability. Key Benefits These increase grip length and control of M20,M21,M29,M30*,M40 and M41 magazines They are made from High Impact Polymer and withstand temperatures from -20 F to 250 F.