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So, if the gun was tuned for the shorter barrel, there would not necessarily be "enough" air for the longer barrel to increase velocity; makes sense. By the way, how do you "tune" an air gun?

I would guess that somehow the gas "pulse" (new to airguns, so don't know the proper terms) would have to be increased to effect a velocity change of any significance. If you increase the volume (longer barrel) with the same amount of gas, the pressure goes down. You need to provide more gas...

McMaster-Carr supply has High Pressure small diameter gauges with 1/8 NPT thread for about $20.00 don't know if this helps you in any way: https://www.mcmaster.com/products/pressure-gauges/pressure-gauges-2~/miniature-pressure-gauges-9/