Looking at different limited guns and I dont understand how a upgraded barrel will improve accuracy within 35 yards. Also if people are being honest in their USPSA matches they rarely shoot that far anyway, which goes back to the question of whats the difference? I have a stock STI barrel for example in the limited gun I shoot now. Other than a different name on the barrel, (KKM Shuman etc.) whats the process they do to make their barrels "out perform" the STI barrels?