The Glock Extended Slide Stop Release with Spring is an OEM part from Glock. This Slide Stop Release with Spring is larger than the standard size (except for Glock 34, 35) but is designed to drop it perfectly. The 3 Pin Model will not fit the Generation 1 and 2 Glock models but it will fit the Generation 3 and 4 Glock models. The Slide Stop Release is constructed from hard steel and has a blue finish. FeaturesHard Steel ConstructionQuality Blue Finish3 Pin Model fits Generation 3 and 4Drop In Replacement