It may be fixed with staking or soldering. A little merchandise is 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 noticed it venture from the rear with the bolt. Winchester replaced that pin https://highimpactrounds.com/product/winchester-aa-12-ga-2-75in-1-1-8-oz-8-lead-1145-fps-25-rd-box/