It can be fastened with staking or soldering. A small product is that the pin which retains the firing pin spring cap tended to operate unfastened, and needed to be tapped again in place as one observed it task through the rear on the bolt. Winchester replaced that pin in https://highimpactrounds.com/product/winchester-super-x-20-ga-2-75in-3-4-oz-rifled-hollow-point-slug-1600-fps-5-rd-box/