There was a thread on Airsoft Retreat many moons ago by a guy by the name of Noobie (same dude who invented the M-trig, TDC system, etc.) that showed mathematically how to volume match your barrel to your cylinder for a VSR.what about barrel length? Which do you think is the best for power/accuracy with a vsr cylinder?
Anywhere between the 2 is good, especialy for a normal length cylindered AEG shooting upto and including .3s, you can get away with a 509mm barrel in full cylindered bolt actions and long cylindered AEGs as there is enough volume of air to support it.From what I've read on ASM there comes a point when barrel length does not matter anymore and that number was either 400mm or 455mm.