Another route is dewats. If you have the ability to work on firearms, you can buy historical military firearms at a discount. Get your C&R license for $30 for 3 years and have WWI & WWII weapons sent directly to your home. More of a hunt for the weapon and parts, but I enjoy all the challenges. If you are looking for investment, or quick sells, this may not be for you. A percentage of buyers will not consider a rewatted weapon no matter how well it runs. I own quite a few.
Brian
Browning1917a1