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. One major advantage to the Gen. 1, 2, 3 recoil spring assembly in your Glock 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. This assembly comes with the Glock stock spring already installed on it.
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