alright magman, before you go shooting your mouth off with senseless crap why don't you first read what i wrote. i did mention that i used compressed air for all guns. each gun had a Nitro Duct tank 68ci/3000psi. and for each test I shot the gun, i did not shoot WITH my friend, i physically took his gun over a crono and shot it. at the beginning of the day he was having velocity spikes, he used it and wore in the o-rings until he was remaining consistant, then i did the test. so shut your mouth with this useless crap trying to flame my experiment.