The Warthog's design is inspired by the A-10 Warthog aircraft. It is machined top to bottom from 7075-T6 aluminum with an oversized and integral trigger guard, beveled magazine flare, and a Multi caliber mark. The Warthog 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.