SIG AMT Advice

[sdmark777]

Hi all,
I am on the fence about something I have been pondering for some time. Thought I would bounce my idea off you guys.

I have this new in the box, unfired outside of the factory, semi-auto SIG AMT .308 rifle. These rifles are scarce and hard to come by. New in the box is very rare. Mine was imported by SIG, distributed by Osbornes and transferred to me in 1986 when I had an FFL. I have seen sales of these up to $20K and I would say currently maybe $25K for new in the box. I have kept this investment rifle all this time never intending to part with it. Back in the 80's when I was on the hunt for an AMT, I kept getting beat out until I scored this one. But, especially now, I can not shoot it with out severely lowering its value. (I do not shoot my Lugers either. But that's different, because, well, they are Lugers!) It is nice to have and look at, but it has advanced to a collectors level beyond mine. So, I now live in the free state of Arizona. I have always wanted an original live MP40. They are about $18k to $25K + depending on if they are tube guns or original C & R's. Seems like machine gun dealers only occasionally have MP40's for sale and I have seen only one at a local gun show. So I thought maybe I could trade the AMT for an MP40? Best scenario perhaps. Hard to find an MP40 let alone an MP40 owner who wants this AMT. Or I sell it, which could take time to find that level of buyer. Once sold, I have to find an available MP40. What if I can't or they increase too far in price by the the time I find a good one. I would then be stuck with out an MP40 or my AMT. Then there are the worries associated with the NFA transfer, as sellers want money up front and there is a lot of fraud. I just found two machine gun sellers online who are total scam artists. I do not need to sell the AMT for any other reason than it would fund my getting an MP40, which otherwise I can not afford. Any thoughts or comments? Should I just go for it and list the AMT?

Thanks, Mark