The Recover Tactical Over Rail is engineered to fit perfectly on the Glock 17/19 Gen 3 or Gen 4 pistols. The Recover Rail is the most stable rail solution for your Glock 17/19. It features a glass reinforced polymer construction, and will hold up in harsh conditions. No modifications are required, and installation will not damage your Glock. NoteTo install, place the two halves of the rail together in position on the gun. Secure together with the supplied hardware. 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.