This is true, I've seen Frank's gun in action; as well as specific examples of shorter barrel length being an asset. I do have a theory though. The bigger the bucking, or should I say the "harder" the spin put on the BB, the more a longer barrel will help by allowing the BB to stabilize. I've noticed very distinct differences between how spring, GBB, GBBR, GNBB, AEG, PTW react with distance, accuracy, BB weight, barrel length, etc. Though the concept is the same, slightly different aspects can affect things greatly.
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