Mossberg Wood Pistol Grip 12 Ga/28 Ported Barrel/Accu Choke/18 Cylinder B.. The Mossberg 500 3-Barrel Combo pump-action shotgun offers an amazing amount of gun for an unbeatable price. The 500 is built to the same…. Mossberg 590 Retrograde 12 Gauge, 20 Barrel mossberg Mossberg 590 Retrograde 12 Gauge, 20″ Barrel. $529.99. Compare. Mossberg 500 Scorpion…