Glock Trigger Mechanism Housing w/ 336 Ejector, 9mm & .380 (Excludes Gen4, Gen5, G19X, 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.