Cross Armory Glock Extended Slide Lock fits all Glock Gen1-5. Designed specifically for Gen 5, our extended slide lock is a perfect fit for Gen 5 and previous models. *Note The Cross Armory Slide Lock fits Gen 5 but is also backwards compatible with all Gen 1-4. The extended slide lock improves slide removal for cleaning and maintenance work, a necessity for any Glock enthusiast looking to improve their weapon. Does not interfere with any holster.