It could be set with staking or soldering. A small 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 from your rear from the bolt. Winchester replaced that pin in https://highimpactrounds.com/product/winchester-sxp-extreme-defender-12-ga-18-in-gray-black-camo-furniture-perma-cote-finish-pistol-grip-stock/