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Why did the MX9 go from .45 cal ammunition to 9mm after the beta. I never saw a reason why they did this. The MX9 was good in the beta but not OP. None of the base SMG’s are anywhere near good like the Daemon is as a SMG at .45 cal. The spitfire could be but only if you’re within a certain range.

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almost 5 years ago - /u/MaTtKs - Direct link

The main reason was a rebalance of ammo types across weapon categories to ensure an even distribution at the time, in this case 45cal vs 9mm. It made sense for this one due to it being the standard SMG while 9mm is typically your standard ammo type.

The ammo type in this case has very little bearing on tuning, with only a slight difference in bullet velocity and trajectory.

Hope that answers your question.