Best type of M4A1?

I just started crossfire and i think that the M4A1 is one of the best guns. It suits my style but i was just wondering what type of M4A1 was the best.

I heard that the M4A1-Custom was the best one. (Correct me if i'm wrong)

How many types of M4A1s are there? How do i get the Custom one? what should i do? (i heard about the Halloween event or something.)

I'm just tired of people with ZP guns going around spraying :[. I have to "tap" with my regular M4.
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