Shop › MOSSBERG 590 SHOCKWAVE 12GA SHOTGUN Image 1 of 1 MOSSBERG 590 SHOCKWAVE 12GA SHOTGUN $519.99 MOSSBERG 50653 509 SHOCKWAVE 12GA PUMP ACTION SHOTGUN, PISTOL GRIP, 14IN BARREL, 6RD FDE. NEW.100338 Add To Cart Added! MOSSBERG 50653 509 SHOCKWAVE 12GA PUMP ACTION SHOTGUN, PISTOL GRIP, 14IN BARREL, 6RD FDE. NEW.100338