I have a nice S&W 686-3 stainless revolver in .357. I never use it, and have plenty of other guns, but I rarely buy or sell firearms. I also have a collectors licence in my state that was required if you buy / sell more than X in a year, but the details are sketchy. Anyhow, I have zero interest in this gun and and would be interested in selling it, or trading for a decent AR-15 type in 5.56. I have looked at Gunbroker but the laws are a bit strange, and the one thing I do not want is some issue with a transfer. Any suggestions ?