The Apex Glock Ultimate Safety Plunger is designed for use in the the Glock 9mm, 40 S&W, 357 Sig caliber pistols and will smooth out the trigger take-up when compared to the original factory component. The Ultimate Safety Plunger maintains proper safety function, even when timing has been adjusted through the installation of aftermarket trigger systems. FeaturesSmooths out the trigger take-up Maintains proper safety functionSolid, dependable construction 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.