Does any bank finance a purchase like this?
Depending on how your credit is, you can get anything
financed. You don't have to even mention what you are buying. You may get the money on a signature (unsecured) loan. You can also borrow against your home, auto, or other personal property. I can't speak for banks, but I know that guns are preferred personal property collaterol for many loan companies because they are valuable and serial numbered, and therefore easier to levy against in a case of nonpayment of the debt.