About the 200th post on this :-)
Not possible to trade. Not a good idea (in my opinion). Bungie aren't doing it.
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Realised it after posting it XD. My bad. My opinion would've been that it's a lot more realistic to have weapon trade and it'll give you more possibilities as a fireteam. The sniper will always get the best sniper or scout rifle of the three, the mid range the best pulse rifle and tge clise range the best autorifle/shotgun. Boosts up the teamplay in my opinion. Maybe the 200th post might convince them it's not a bad idea? :)