Precision machined from ordnance grade steel and designed to interface in near tolerance While using the aluminum stock chassis. For sling accommodation, 4 integral metal inserts are embedded for QD type sling swivels (QD swivels not integrated), and is also Outfitted with two conventional UM fashion sling swivel studs. The https://knightsarmamentm4quadrail63931.blogars.com/28828235/new-step-by-step-map-for-sage-international-sks-chassis