These conversion barrels turn your 12 gauge Mossberg 500 into a muzzleloading rifle, perfect for conicals or saboted bullets. This barrel system requires no gunsmithing to install. Simply remove the factory barrel on any 6 shot Mossberg model 500 and replace with this muzzleloading barrel. Uses 209 primers for ignition and includes rifle sights and a brass-tipped ramrod. Barrel features a 1 in 26" twist for best use with sabots. Barrel includes a full length ramrod to ensure proper and consistent seating of bullets. Ramrod features 8-32 threads on one end and 10-32 on the other end to allow use with all popular muzzleloading accessories.