Glock Recoil Spring Assembly Dual 9mm (G19 Gen5 G19X G45 G47 MOS) Marked 1-7. This steel and polymer dual recoil spring assembly will fit Glock G19 Gen 5 G19X G45 & G47 MOS pistols chambered in 9mm. 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.