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There are a few areas that define "accuracy", and are affected by various components:
1) Accuracy through consistency (knowing where the shot will hit, every time - solved by tighter groupings, more consistent gas output, and precision fitment of components between the sights and the muzzle)
2) Accuracy over range (solved by greater output power, or tighter groupings)
3) Accuracy by user interface (lightened trigger load will cause the shooter to be less likely to "jerk" a shot)
4) Accuracy in follow up shots (less muzzle flip will yield faster and more accurate follow up shots. Huge blowback and muzzle flip will cause greater sight drift.)
5) Accuracy in pointability (transition from target to target, a gun with greater pointability will be able to get on target faster.)
As you can see, there are two main groups to accuracy. The first, is accuracy in the gun. The second, is accuracy with the shooter (and the shooter interface.)
There is no single easy answer to your question, but if you want to focus solely on the gun, start with the inner barrel and moving to a heavier weight BB. I personally prefer a minimum of 0.28g.
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