Young Manufacturing’s Side Charge upper is the ideal AR15 upper receiver to us with our side-charge bolt carriers. Our Billet Upper Receiver features an exclusive rear cover that prevents gases from escaping and hitting the shooter. This cover easily flips up for insertion or removal of the bolt carrier and is locked into place by the lower receiver once assembled. The billet construction delivers extreme precision and is compatible with our National Match Side Charge Bolt Carriers. This upper is compatible with all lower receivers and has been specifically machined to be compatible with the Magpul B.A.D. Lever.