This AR-15 BCA 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 bear creek arsenal AR 15 right side charging upper receiver.
What magazine/ammo does BCA recommend for each caliber?
These are brands that BCA uses in the facility to test fire our products. However, there are several brands that will also function properly. Caliber Magazine Ammo Grain Weight Ammo Brands BCA Status AR15 - 223/5...