It can be mounted with staking or soldering. A small product is that the pin which retains the firing pin spring cap tended to operate loose, and had to be tapped back in place as a person noticed it challenge within the rear from the bolt. Winchester replaced that pin https://highimpactrounds.com/product/winchester-m193-5-56-nato-55-gr-fmj-3180-fps-200-rd-box/