Its very simple
This isn't real steel, longer barrels don't equal more accuracy
A 6.01 barrel will theoretically have the same accuracy as a 6.10 barrel, but the 6.01 will foul faster causing accuracy loss after just one mag.
With my VSR's 6.03 barrel I noticed accuracy loss due to fouling after just 120rnds
The BB isn't actually supposed to touch the barrel at any point after the hop, its just a cushion of air that guides it centered down the barrel. So whether its a 6.01 or 6.10, the physics are the same, they both use air pressure to center the BB, just one has more room to allow for fouling.
The same goes for shorter barrels, beyond a certain length, once a BB is stabilized its stabilized and no extra amount of barrel will make it any more stable.
Case and point; compare a stock M16a3 against a KSC USP
The USP gets very comparable range despite having a 4" barrel vs the M16s 20" barrel.
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