As stated in the title, the Cyrus 9.3mm rifle is powerfull beyond any standards. In my oppinion it should either be completely removed (even tough that would be a waste) or seriously revised.
What i would reccomend for the ballance of it:
I think you've misunderstood the reason for the wide variety of rifles and weapons. They are not supposed to be balanced, but to give you an advantage over your adversaries.
If you see a whole team wielding a Cyrus, you better disengage with your infantry team and bring something else like an APC/IFV/MBT or long range sniper team.
I understand it's suposed to be powerfull, I'm just saying the ballance comparing to the NATO counterpart is almost not there. so i guess its an option to make the mar-10 more powerfull as well.