I think a gun shop would be less risky than opening a restaurant or clothing store.
A restaurant has to have food for everything on their menu. If people don't order the food you have bought, you have to throw it out.
If you have a clothing store, you have to stock many different sizes, colors and styles. If you don't sell all of them (and you won't) at retail, you will have to drastically discount them to get rid of the unsold sizes, unwanted colors and the styles that drop from favor.
Ammunition doesn't spoil and gun tastes change very slowly and old stock can increase in value.
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