If you're interesed in a long-term career that offers the possibility of a good lifestyle, then I'd say that you'd be misdirecting your tool and die skills (assuming you ever have such skills) if you tried to use those skills in gunsmithing.
Very few gunsmiths make very much money. You'd be better off with a career in the Navy then with trying to start a gunsmithing business from scratch...from an economics perspective.
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