This AR-15 side charging Receiver and Bolt carrier group (BCG) combo will work with any mil-spec .450 Bushmaster or .458 SOCOM barrel.
This combo is a gen 2 right side charging upper and BCG (patent pending), it includes an AR15 bolt carrier group (BCG), a right-side charging (Gen2) handle (patent protected), a threaded receiver plug, and the AR 15 right side charging upper receiver.
