They should take after what The Division did, allow trading within your own fireteam right after the objective is complete within 30 minutes.
As soon as you kill Oryx or whatever, you can trade with anybody on that fireteam, before equipping it, if equipped, can't trade.
If you leave the fireteam, can't trade anything you just got...
Really an easy solution...
English
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This isn't the Division.
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It's still a good system
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That's great, for that game.