These units replace the magazine base plate. They do not alter the capacity of the magazine and provide better comfort by adding approximately 1/2 inch of gripping surface. Key Benefitsa These units blend with the contours and texture of the handgun and have a factory appearance.a They are made from High Impact Polymer and withstand drop tests at temperatures from -20 F to 350 F.a They provide control and comfort without sacrificing conceal ability.