Sentence examples for a shotgun from inspiring English sources

The phrase "a shotgun" is correct and usable in written English.
It can be used when referring to a type of firearm or in idiomatic expressions, such as "shotgun" in the context of claiming a seat in a vehicle.
Example: "I called shotgun for the front seat, so I get to sit next to the driver."
Alternatives: "a firearm" or "the front seat claim".