It may be set with staking or soldering. A little product is that the pin which retains the firing pin spring cap tended to work unfastened, and needed to be tapped back in place as one observed it task in the rear of the bolt. Winchester replaced that pin in https://highimpactrounds.com/product/winchester-super-x-270-win-150-gr-power-point-2850-fps-20-rd-box/