I would only get behind trades for the same rarity gear. That way, if you earn a legendary gun, but it isn't the type you like, you could trade it and still have earned a weapon of that tier. That said, forcing you to keep it may get you to use something you otherwise may have not so I am fine with it.
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thats the idea of my trade system. however deej already said in an interview that there will be no trade system.