I have probably posted this video by Robert Lane before https://www.youtube.com/watch?v=qdoY-4EtYd0, but I think it never can be watched to much. I see many complain about the gauges on some guns are not accurate, or why one gun has different reg pressure than another one. But after watching this video, I think many will understand why. He even point out that the manufacturers themself say they should not be considered gauges, but rather indicators
