It can be mounted with staking or soldering. A little item is that the pin which retains the firing pin spring cap tended to operate unfastened, and had to be tapped back again in place as just one observed it venture through the rear of your bolt. Winchester replaced that https://highimpactrounds.com/product/winchester-target-223-rem-55-gr-fmj-3240-fps-20-rd-box/