If you prefer a pump shotgun for self defense, I think that you would have a hard time coming up with something better than this:
Mossberg 590 shotgun with8-round magazine and a rifle-type ghost-ring sights
Here is the factory description of this weapon:
Type: Pump action shotgun
Gauge: 12; 3" / 76 mm chamber
Barrel length: 500 mm / 20" or 450 mm / 18" ismost common. others available.
Magazine:underbarrel tube magazine, 8 rounds
Mossberg 590 was developed by O.F.Mossberg &sons company (USA) in the mid-1970s as a "military specifications" (adopted for US Military) modification of the Mossberg model 500 shotgun. "Militarization"included strenghtening of the receiver and other parts, installation ofthe vented heatshield around the barrel,bayonet lug and extended magazine, as well as an aluminum trigger guard instead of plastic one. Standard finish is Parkerizing, and the gun is usually provided with replacement pistol grip, which allows easy converion to 'Cruiser' modification and back. Since 1987 this shotgun is a standard equipmentof US Armed forces; while it was officially replaced in US Army with Benelli M1014 semi-automatic shotgun, Mossberg 590 shotguns are still widely used by US Navy and US Marine Corps.