My VSR, MK23, and PTW all have barrels that are ridiculously short (all under 305mm or 12") for how long they all shoot. In fact, my most accurate guns have the shortest barrels.
I'm firmly in the camp that says the quality and consistancy of the inner barrel as well as the quality and consistancy of the hop up make the the most difference in accuracy.
Typically a good tightbore will be manufactured to higher tolerances which I believe accounts for it's increase accuracy over a stock barrel.
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