The Shadow Systems Firing Pin Safety Assembly for Glock 17, 19, 22, 23, 24, 26, 27, 31, 32, 33, 34, 35, 37, 38, 39 offers a 17-4 stainless steel firing pin safety machined out of a solid billet of American steel. The firing pin safety is machined to exactly match the weight and dimensions of a stock firing pin safety to ensure it goes bang every time. FeaturesFits all 9mm Glock models Gen 1-4, except 42, 43Heat treated 17-4 stainless steel firing pin safetyStandard weight firing pin spring 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.