i have a level 10 already, as the description says. lvl X = level 10
and getting a regulator on a mag is pointless. notice, nobody else has regs on thier mags. its because the valve has a regulator built in. not saying it wouldn't work with a reg on it, but it would be a waste of money, seeing as how there wouldn't be an inch of better performance. mags need at LEAST 700 psi in the valve to opperate as cleanly as possible. the best performance can be achevied at about 900 psi.