It can be mounted with staking or soldering. A little item is that the pin which retains the firing pin spring cap tended to work free, and had to be tapped back again in place as a person saw it venture through the rear in the bolt. Winchester replaced that https://highimpactrounds.com/product/winchester-super-x-20-ga-2-75in-3-4-oz-rifled-hollow-point-slug-1600-fps-5-rd-box/