Designed for owner installation, the Venom 10 round rotary kit delivers faster cycle times, greater shell capacity and lighting fast reloads to your Mossberg 12 gauge, transforming your shotgun into a Sidewinder Venom mag-fed tactical shotgun system. The kits are available for either 590 series or 500 and 88 Mossberg 12-gauge pump shotguns configured with 5/6 shot magazine tubes and 18" barrels. The complete shotgun magazine conversion kit for at-home installation includes 10-round box magazine, forend with action bars, magazine tube, barrel clamp, forend grip, cutting tool and installation guide.