I think it could be done if a person has the correct abilities to be able to buy at reasonable prices. One problem with any investment plan is if the person doing it is not very good at that type of investing, someone else will likely end up with the better end of the deal.

So if you think you have special knowlege of guns and can manage such an investment, it might be a form of diversification and even profit.

Or I could say what some opponents of gold always bring up. "The government will just confiscate it anyway so no reason to own it". I would say just the opposite. If it is something the government is afraid of enough to confiscate, that is one reason good enough to own it.

John