The conversion kit to change your Gen 4 Glock to allow it to use the Gen 1,2, & 3 recoil spring. The insert is made from steel and is black anodized to match your Glock. This kit is for the G-17,22,31,35, & 37 Gen 4 pistols. Includes the insert and the Glock O.E.M. recoil spring assembly.
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