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Pump action shotguns are pretty cheap even new. I think you can find Mossberg shotguns pretty cheap. Pistols are not always cheap, but 38 revolvers or used Rugers and such aren't too bad.

I guess it depends on how well you know him. Ask him point blank if he can legally own a gun.

Selling it to him is a good idea. Loaning the money to buy a gun is another. Taking him shooting and giving him a good safety drill is the best idea if you are considering the first two. You should also Impress on him the idea that using a gun will kill someone and he had better be willing to do it if necessary.