It may be set with staking or soldering. A small product would be that the pin which retains the firing pin spring cap tended to work loose, and had to be tapped again in place as one particular noticed it venture through the rear in the bolt. Winchester replaced that https://highimpactrounds.com/product/winchester-super-x-22-lr-round-nose-40-gr-1300-fps-100-rd-box/