It could be fixed with staking or soldering. A small merchandise would be that the pin which retains the firing pin spring cap tended to work free, and needed to be tapped again in place as 1 observed it project from your rear with the bolt. Winchester replaced that pin https://highimpactrounds.com/product/winchester-defender-12-ga-2-75in-1-oz-rifled-slug-00-buck-1150-fps-10-rd-box/