American National Firearms accessory kit for Glock Generation 4 model 19. Set includes stainless steel dual-spring recoil guide rod system, extended slide lock and a 4-piece frame pin set. These parts fit Glock Gen 4 model 19 (G19.) They are all perfect, just like your Glock. This is for a Generation 4 Glock 19 only. It will not fit Generation 1, 2 or 3 models. Please do not try to make it fit other generations, it will not fit, and you can not make it fit. It fits the Generation 4 Glock model 19 only. Lifetime warranty.