The RYG extended slide lock has angled cutouts on the ends for maximum finger grip when field stripping even with slippery or oily hands. CNC machined barrel lug notch for superior lock up compared to the Glock OEM slide lock. Low profile that does not protrude beyond frame which also allows for no holster wear. Made from precision cnc machined 416 heat treated stainless steel for a lifetime of use. Fits G42/43. The slide lock is Tin Coated. The Tin coating increases hardness, abrasion resistance and reduces friction and heat buildup. This process is often used to increase the lifespan of machine parts and cutting tools. The Gold TIN coating is applied using a Physical Vapor Disposition process and the micronized nature of the application does not increase any functional tolerances of the pistol.