Lantac Glock Upgrade Firing Pin - Precision machined 17-4PH Stainless Steel hardened to H900 condition with a natural heat treated copper color surface finish. This upgrade firing pin has been lightened with a series of chamfer cuts that reduce weight and retain strength. Improved sear geometry yields a crisper and more consistent trigger pull. Works with G17 & G19 only. Manufactured in the USA.