"I want a gun that is easy to resell and will hold its value (increase in value would be better)."

If this is an investment, then depending on price, it's a bad one. (At a low enough price you may be getting a bargain, but not at Fair Market Value for an unaltered gun.)

If you are looking for a gun to use then it may or may not be a good deal. Ian's given you excellent advice in either case.

My problem lies in reconciling my gross habits with my net income.
- Errol Flynn