LanTac USA LLC GFP-E Firing Pin Safety Plunger and Spring, Fits Glock 17 and 19, Stainless Steel, Silver 01-GP-ESP-SS Precision machined from 17-4PH Stainless Steel the Firing Pin Safety Plunger has an ultra smooth domed head" which reduces friction and trigger pull weight. Also comes complete with a reduced power spring for additional smoothness to trigger pull.