Makes take-down a breeze. Widens the take down slide lock by .040". This is not a slide release, this is the takedown which passes through the slide and protrudes from both sides of the frame. Drop in, no gunsmithing required. Heat treated for durability. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.