Glock, OEM Firing Pin Safety, Includes Spring, 9MM, Fits G17, G19, Gen 5. The Glock G17 / G19 Gen5 Firing Pin Safety is upgraded to the same configuration as the G42/43 pistols for enhanced reliability and a smoother trigger pull. The G17 / G19 Gen5 Firing Pin Safety completely blocks the firing pin from moving forward until the trigger is pulled, then it is pushed upwards, allowing the firing pin to strike the cartridge. As a result, the firing pin CANNOT contact the primer if the pistol is dropped or otherwise suffers an impact. This factory replacement Glock G17 / G19 Gen5 Firing Pin Safety comes with its spring, so you are ensured a precise fit in your pistol and reliable operation of this critical part.