Designed not to overlap or jam the receiver when cycling the pump action. Complete with adapters new interchangeable components fit most popular 12 gauge pump shotguns, Remington 870, Mossberg 500, Winchester 1200, Winchester 1300, Defender, and Maverick. Constructed of indestructible black polymer nylon. Easy to install, no modifications or gunsmithing required. Includes an Unconditional Lifetime Warranty, Advanced Technology, 102 Fieldview Drive, Versailles, KY 40383, 1-800-925-2522