I have sold and traded a few guns, and don't regret any of them.
So far I have done one or the other with 3 SKS's, an American Arms CX-22, and a hi-point .40. Since getting into revolvers I am tempted to trade of sell my WASR 10/63 and an XDm .45. Havnt done either yet though. I might trade my Smith and Wesson Model 36 for a Ruger sp-101 straight up, Doubt that will happen though.
I have Heard the Rhino is great, and I would love to own one some day. Just a matter of time and money, I have plenty of one and very little of the other.
There is no such thing as Overkill, Dead is Dead!