For sale is a semi-automatic, magazine fed, 12 gauge shotgun manufactured by Rock River Arms.  The weapon is chambered for 3" and 2 3/4" shells.  The magazine capacity is five rounds plus one in the chamber.  The shotgun features AR-15 ergonomics and controls familiar to most shooters.  Both the upper and lower receiver are made of 7075 T6 aluminum, making it lightweight.   This shotgun is new with 2 magazines, but no box.