Quote:
Originally Posted by L473ncy
The reason why a longer barrel gives you an FPS boost is because the gas has a longer time to expand and force the BB to accelerate. This works to a certain extent though, once the gas has all expanded it doesn't matter if you add in a longer barrel it will max out at a certain FPS after all the energy from the expansion of the gas has been transferred to the BB.
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I don't think thats necessarily accurate. The design of GBB, at least the Negative pressure based system, will keep releasing gas until the BB has physically left the barrel, causing the pressure at the BB side of the nozzle to drop, thus shutting off the floating valve and initiate the blow back cycle and trip the gas shut off and all that jazz. Which means longer barrel, the gas will keep flowing until the BB exists. AEG and springer works on a constant volume of air being "compressed" through the stroke and diameter of the piston, GBBs that number is not constant. Its also the same reason why a heavier BB actually may not loose as much fps in a GBB, since the BB is moving slower, more energy of the gas is being imparted onto it since it stays in the barrel longer.
The only way that you "fully expand" the gas is if you physically emptied the mag supply of gas...