Question about LEGAL second hand gun sales

I have a bolt action hunting rifle that I bought as my first gun ever. It turned out not to be what I needed, so I eventually bought another rifle to replace it. I've been hanging on to this gun for several years and have finally decided it is time to let it go.

My question is, what is the best, LEGAL way to get most for my rifle. I live in Georgia, if that helps.

P.s. I own several other guns now, and while I could just hang on to it, I don't ever foresee my using this rifle in the future, and I'd like to free up the cash for a future AR10 purchase.