Shotgun

Regular shotguns:
 * Double-Barrel Shotgun in Fallout, Fallout 2, Point Lookout and Fallout: Brotherhood of Steel
 * Sawed-Off Shotgun in Fallout 2 and Fallout 3
 * The Kneecapper (unique variant)

Combat shotguns:
 * City-Killer Combat Shotgun in Fallout and Fallout 2
 * Drum-Magazine Combat Shotgun in Fallout 3
 * The Terrible Shotgun (unique variant)
 * H&K CAWS in Fallout 2 and Fallout Tactics
 * Pancor Jackhammer in Fallout 2 and Fallout Tactics