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. DISCLAIMER: 'GLOCK' is a federally registered trademark of GLOCK, Inc. and is one of many trademarks owned by GLOCK, Inc. and GLOCK Ges.m.b.H. Neither Pearce Grip, Inc. nor this site are affiliated in any manner. This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.