Team Fortress 2 has made it into Fallout 4!
So what is this gun? according to the tf2 wiki:
The Scattergun is the default primary weapon for the Scout. It is a short, double-barreled lever-action shotgun with a wooden handle and foregrip.
Delivering ten pellets per shot with increased ramp-up, this weapon is deadly at close range, requiring only two shots to take down most classes. A wide cone of fire causes it to become mediocre at medium range and near useless at a distance. This forces players to close in on enemies to effectively deal damage while utilizing the Scout's distinct speed to avoid retaliation.