For Gen5 models 17 & 34.
NOTE: This is NOT the complete unit. This is the captured recoil rod only. Reloaders and competition shooters looking to dial in a custom spring weight benefit from purchasing this item's ability to easily change springs. Please be sure to purchase an ISMI recoil spring or recoil spring kit.
NOTE: Unless stated in your order notes, if you purchase an ISMI spring, it will be installed before shipping. If multiple springs are purchased, the stock weight will be installed prior to shipping unless stated in your order notes.
For stock weight, please see item # GL-17 below...https://www.glockmeister.com/ISMI-Stock-Power-Recoil-Spring-17-Pound/productinfo/GL%2D17/