Plus Extension for GLOCK model 26/27/33/39 These units replace the magazine base plate and internal floor plate on third generation magazines. They will add three rounds to the Glock M26, two rounds to the Glock M27 and M33 and one round to the Glock M39. These units will add 1" additional length for better control and comfort.*250 round break in period required on many of the newer magazine springs to allow for easier loading of the last extra round. *Check your state and local laws regarding magazine capacity restrictions. Key Benefits These units blend with the contours and texture of the handgun giving a factory appearance. They are made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 250 F. They form the next logical finger positioning feature to provide control and comfort without sacrificing conceal ability. Provides magazine identification via Mag-Track for those that rotate magazine usage. 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.