[Fiction question] What does my character do for a living?

My character “R” (one of the antagonists to “J” of this question) is a tall, brawny, muscular guy (not like a weight lifter—more like a middle-aged guy who is really fit). He looks and dresses kind of like your classic cowboy stereotype, and he has a Texan accent, but he isn’t a cowboy.

What is his occupation?
— It keeps him fit and strong.
— He is a free agent at least part of the time.
— He has work that brings him to California.
— He is not any kind of private detective or law enforcement person, but he has weapons knowledge.
— He is not terribly well paid.