It may be preset with staking or soldering. A small product would be that the pin which retains the firing pin spring cap tended to work free, and had to be tapped again in place as 1 noticed it undertaking through the rear from the bolt. Winchester replaced that pin https://highimpactrounds.com/product/winchester-super-x-270-win-150-gr-power-point-2850-fps-20-rd-box/