Pearce Grip Extension For Glock 4th Generation Models 26/27/33/39 Adds 1 Inch. They do not alter the capacity of the magazine. These units will add 1" additional length resulting in better control and comfort. Features of Pearce Grip Grip Extension Fits Glock 4th Generation Models 26/27/33/39 Adds 1 Inch PG-26G4: These units increase the grip length of the Sub Compact Glock AutoPistols with out increasing their capacity. 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 350 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. Package Contents: Pearce Grip Grip Extension Fits Glock 4th Generation Models 26/27/33/39 Adds 1 Inch PG-26G4 Specifications for Pearce Grip Extension For Glock 4th Generation Models 26/27/33/39 Adds 1 Inch: Manufacturer: Pearce Grip Color: Black Fabric/Material: Polymer Gun Make: Glock Gun Model: Glock 39 Glock 33 Glock 27 Glock 26 Package Contents: Pearce Grip Grip Extension For Glock 4th Generation Models 26/27/33/39 Adds 1 Inch What firearm models does the manufacturer say Pearce Grip Extension For Glock 4th Generation Models 26/27/33/39 Adds 1 Inch is compatible with? The manufacturer suggests that Pearce Grip Extension For Glock 4th Generation Models 26/27/33/39 Adds 1 Inch is compatible with Glock 26 Glock 27 Glock 33 Glock 39Pearce Grip Grip Extension For Glock 4th Generation Models 26/27/33/39 Adds 1 Inch