It might be set with staking or soldering. A little item would be that the pin which retains the firing pin spring cap tended to operate unfastened, and needed to be tapped back again in place as a single saw it job from the rear in the bolt. Winchester replaced https://highimpactrounds.com/product/winchester-target-7-62x39-123-gr-fmj-2355-fps-20-rd-box/