Precision machined from ordnance grade metal and created to interface in near tolerance with the aluminum stock chassis. Some rocket surgeon drilled and tapped this or else-pristine stainless Mini-fourteen for an aftermarket scope mount. I was thrilled. I crammed the holes with stubby small Allen screws and saved about $400. https://buy-domestic-steroids23067.therainblog.com/30809629/about-sage-ebr-sks-stock