GLOCK 47877 Slide Stop Lever & Spring 9mm Slim for G43X, G48Genuine Glock factory replacement slide stop lever with spring 9mm Slim designed Glock pistols with 1. 10" wide frames specifically the Glock 43 and Glock 48. The slide stop lever provides a means to manually lock the slide open after the last round and to release the slide forward. It features horizontal texture on the exposed surface for reliable, tactile engagement. As an OEMspec part, its built to Glocks original quality and fit standards.