A shotgun, also called a "scattergun," is a firearm designed to shoot a multitude of lead or steel balls of varying sizes, greatly increasing the weapon's hit potential. This makes it very effective at hunting game. However, the accuracy and power found at close range starts to diminish as the target gets farther away. Shotguns designed for the military's use are often called "combat shotguns."
It looks identical to its regular version, the double-barrel shotgun, but differs in damage, price and other characteristics. It can only be repaired with combat shotguns.
Pa's Fishing Aid can fire a total of about 125 shots from full condition before breaking.
The weapon is cut from the game and can only be acquired through the use of the console, or transporting to the test cell location DLC04testPhil and picking it up from the table.
This weapon deals the same damage in a non-critical hit as The Terrible Shotgun, but has a much smaller ammunition capacity (2 round chamber). Critical hit damage outside of V.A.T.S., however, is much larger due the larger number of pellets.
Behind the scenes
The following is based on unverified behind the scenes information and has not been confirmed by canon sources.
The name is a reference to the commonly known idiom "shooting fish in a barrel" or a method of fishing known as "shotgun fishing" - in which a fisherman simply fires a large rifle or shotgun into a pond, using the shock-waves to kill fish.
End of information based on unverified behind the scenes information.