Glock Firing Pin Assembly 9mm (G17 Gen5, G19 Gen5, G19X, G26 Gen5, G34 Gen5 MOS, G45, G45 MOS). This is a factory original Glock Part. It is made to the same high standards in material and workmanship as the parts that originally came in your Glock firearm. This part is perfect to replace your worn or damaged parts, or to have as a spare to keep your Glock in top operating condition.