I’ve got a new in box Benelli M1 Super 90 that was made by Heckler & Koch back in the 80’s. Not only is this a perfect new version of arguably one of the best semi-auto shotguns out there, it also has the awesome quirk of being one of the rare versions built by HK over 40 years ago. 
Super collectible, or super usable. The few of these on gunbroker are selling used for close to $2k and the only difference is they have the full magazine extension which is a readily available part. 
I’m not interested in any trades that aren’t in the same price range. You can make an offer but cash is more likely to catch my interest.