manastones effect on a class

hey guys im just a little confuse about manastones effect
I thought if you want stun or stumble you can build a full accuracy set.
whats the difference of the effect of accuracy and magic accuracy?
some others say mag accuracy affects the stuns and stumble some say its the accuracy only..
and the MR how does it can avoid stuns. as we all know stuns can be the effect of a physical attack or a magical attack so it cant always avoid by the magic accuracy right???

 

MR helps avoid stuns and magical attacks, Accuracy does not increase the chances of stun, but Macc does when it comes to stuns that aren't physical.

 

ACC is the chance of yours physical attacks works, M.ACC is the chance of yours Magical attacks works, and MR is the chance you have to resist enemy's magical attacks.
Better ACC = Better chance on physical attacks. M.Acc = More chance of yours stuns, silences, magical attacks works.
Depending on the skill thats used for stun, it can be affected by M.Acc(Ex.: Arcade tunderbolt) or ACC(Ex.: Ambush)