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Balance
Fragment of a discussion from Talk:Combat Mastery
Yes, and yes.
If you're still not convinced, plug the approximate balance equation in the Wiki and see if you come out with the right balance. Otherwise, you can simply have your alt equip a shuriken/guns and rank up combat mastery, but I can tell you that it does affect it. I really don't see any reason to not believe it.
Here's a list of weapons that will get affected by combat mastery:
Swords
Blunts
Axes
Lances
Knuckles
Scythes
Control Bars
Dual Guns
Shurikens
Wands