This thread is dedicated to the firearms of O.F. Mossberg & Sons... The 500 series comprises widely varying models of hammerless, pump action repeaters, all of which share the same basic receiver and action, but differ in bore size, barrel length, choke options, magazine capacity, and "furniture" ( stock and forearm) materials. Pictured above is my Mossberg 500 Cruiser chambered in 12 gauge. I have it configured with a pistol grip, but also own a full length stock.