Someone took the time to chop the last few inches off the barrel and stock of this shotgun. Now, the wide spread of this hand-cannon's short-barreled shots makes it perfect for short-range crowd control.
A shotgun, also called a "scattergun", is a firearm designed to shoot a multitude of lead or steel balls of varying sizes. This makes it very effective at hunting game, greatly increasing the weapon's hit potential. However, the accuracy and power found at close range diminish rapidly as the target gets farther away. Shotguns designed for military use are often called "combat shotguns".
A note should be made that it´s the only shotgun that only uses one hand, making it quite useful early on for users of the One Hander Trait. While this weapon is powerful, it can only fire two shots before having to be reloaded. If you want to make the best of this, make the enemy come to you. For example, alerting an enemy to your presence and hiding around a corner will make the target come to you. If you wait close enough to the corner, you can wait as your enemy spends his turn in rounding the wall or object and squeeze off two unanswerable rounds to the head. Cassidy, when you recruit him in Vault City, comes with this weapon. Frog Morton's Minions also carry them.