It might be fastened with staking or soldering. A little item would be that the pin which retains the firing pin spring cap tended to operate free, and had to be tapped back in place as just one observed it task in the rear with the bolt. Winchester replaced that https://highimpactrounds.com/product/winchester-super-x-270-win-150-gr-power-point-2850-fps-20-rd-box/