Reba II

Reba II is a unique weapon in Fallout 4.

Location
The Reba II can be found in the Rook family house, in the town of Salem, in a locked back room in the basement. It can be obtained after helping Barney Rook by activating his turrets; killing him and getting his key; or stealing the keys after he invites the player into his house.

Behind the scenes
This is likely a reference to the world famous actress and country music singer Reba McEntire, who portrayed a firearms enthusiast and backwoods hunter in the 1990 film "Tremors". In the film, Reba's character carries and uses a generic .308 hunting rifle, as well as talking about and showing off a larger caliber "elephant gun" that she and her husband own, and later use to fight off the movie's creatures.