This AR-15 BCA side charging Receiver and Bolt carrier group (BCG) combo will work with any mil-spec 6.5 Grendel or 6mm arc barrel.
This combo is a gen 2 right side charging upper and BCG (patent protected), it includes an AR15 bolt carrier group (BCG), a right side charging bolt handle, a threaded receiver plug, and the bear creek arsenal AR 15 right side charging upper receiver.
