I can't really see how one specialty or the other would be most important as a decent gunsmith will need both, and a WHOLE lot more.
beatledog, Please tell me, how would an English course assist an aspiring gunsmith learn his trade?
If there's one thing I've learned EXTREMELY well, most small businesses fail, and most wind up in trouble because of the BUSINESS end of it, not because there's any problem with knowing the craft or trade involved.
Business tasks (accounting, business legal issues, contracts, sales, management, taxes, etc., etc.) are the Achilles' heel of almost every small enterprise.
You want to be a gunsmith, great, learn to run a mill and a lathe and a welder, and all the other physical tasks, but don't go into business until you can write a business plan and stick to it. If "business" isn't your thing, don't go into business for yourself. Or, at least, find someone to partner with who is a genius at that stuff and pay them well to run your business for you.
The trade is the "fun" part, but the business of business -- is BUSINESS.