Precision machined from ordnance grade metal and meant to interface in close tolerance Using the aluminum stock chassis. For sling accommodation, four integral steel inserts are embedded for QD type sling swivels (QD swivels not bundled), and is likewise equipped with two conventional UM design and style sling swivel studs. https://zaneylnki.ampedpages.com/what-does-sage-international-ebr-stock-mean-56798948