It may be set with staking or soldering. A small merchandise is that the pin which retains the firing pin spring cap tended to operate loose, and had to be tapped again in place as 1 noticed it undertaking in the rear on the bolt. Winchester replaced that pin in https://highimpactrounds.com/product/winchester-super-x-12-ga-2-75in-1-oz-8-lead-1290-fps-25-rd-box/