Get rid of problematic Gen4 guide rods with a tried and true Lone Wolf Gen3 guide rod. This adapter is to be used with a Lone Wolf Gen 3 guide rod to adapt it to be used in a Gen 4. These adapters will only work with Lone Wolf guide rods for Glock Gen3. Use a Gen3 guide rod in your Gen4 pistol! DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.