I just got my sixth. Why isn't there a trading system?
[spoiler]I had to back out to pick up the bounty, which I didn't need because all the Ultras are at the beginning lol. Anyways, that's why I had significantly less kills. [/spoiler]
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I have 4. I [b]had[/b] 6, but started to dismantle after my third. I have the fourth one just in case there ever is a trading system so I can give it to a friend or a random.