The Overthrow is an open mag well helmet design, with battle worn dents, sword gashes and crack lines. It is machined top to bottom from 7075-T6 aluminum with a Multi caliber mark. The Overthrow is fully compatible with all mil-spec internal parts and other aftermarket mil-spec upper receivers, and GI standard issue magazines as well as PMags. NOTE: Requires a lower parts kit, buffer & stock of your choosing to complete.