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This conversion kit allows you to use the Gen 1,2, & 3 recoil spring assembly on your Gen 4. Gen 4, is that you are now able to change springs out on your Gen 4 with just using the hex screw on the end.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.