I already commented this in response to a post.
"I think it would be a bad idea. It would have the effect Borderlands trading had. You'd get powerful green (and higher) weapons through trading and effectively lose the excitement of a nice loot drop from a boss because.... The weapon in your hand is already better than than nice sexy new weapon that just dropped from the boss you just spent a half hour fighting.
I think it would severely diminish the overall experience **cough**borderlands**cough**"
English
#feedback
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What about you can only trade a rarity for the same rarity. But also the weapons could be sorted into groups by a level that is based on how powerful the weapon is and can only be traded with another weapon in the same level. This would prevent powerful weapons from being traded with weaker weapons. So like you have your starter weapon but you don't like the gun type so you trade it for another in the same level. So to trade it has to be same weapon level, group (special, heavy, primary) and the same rarity. Other things can be traded based on rarity.