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 through the miscellaneous quest Gun Run ; 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.

Bugs
After talking to Barney and accepting the sidequest, Barney may immediately open the door to the room with Reba II, allowing the player to take the weapon without having first activated the turrets.