I have chronoed a 16 and a 20 inch barrel and, of course, I noticed a difference in FPS out of each one. The longer giving me the most FPS. Is the max really a function of the nature and quality of each individual chamber and barrel? Yesterday one of my shots registered over 3100 FPS a significant increase over all the others and it got me to wondering what the max FPS was, if it can be generalized. Again I am NOT interested in pushing the FPS just being careful.