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 & 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, M4-style stock, cutting tool and installation guide.