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You could list it here in the WTS forum, we have collectors of FN family rifles...one has an extensive collection.

Not unless you need one. Here's some for sale in the UK for example. Convert the GBP to USD and see what it's value is. Could likely ask $125 USD for it as it's about new? Still need a guy that...

It's a body cover for an FN series of rifles. I think it's the mount for the UK Suit sight without the sight of course...