It can be fastened with staking or soldering. A little item is that the pin which retains the firing pin spring cap tended to operate loose, and needed to be tapped back in place as just one noticed it project with the rear from the bolt. Winchester replaced that pin https://highimpactrounds.com/product/winchester-defender-segmented-slug-12-ga-2-75-in-1-oz-1600-fps-10-rd-box/