This is an ORIGINAL smll caliber magazine plug Winchester 1873 and 1892, fitting caliers .25, .20 and .32, .20 lever action rifles. This plug has the lip which fits into the slot on the underside of the barrel. This plug fits into the barrel Forearm of the magazine tube. Remember when you remove the screw to take the plug out there is a lot of tension on the plug from the magazine spring.