2 things. It may be new but since they haven't been made for a while, it may have been setting. You may want to re-lube it as it could be dry.
Regs need some head pressure to operate correctly. That is, pressure above what you are running at. Maxflo's are known to spike up and/or leak if the incoming pressure gets too low. They are generally good regs but will do this as will others when the pressure gets down to 250 or so in the tank.
Equalized Black Impulse #9792, Kapp on/off, Check-it low-rise, Dye 71/45, full Freak, JHII, SS RatHole, SP Mag trig, NDZ Equalizer bolt, Slik-Shot & R.I.P. valve, Hybrid grips.
Gen-E LCD#22139, toxic breach, Gold Evolve, ccm feed, cp reg & asa
99 Shocker Turbo/SelectFire #7069
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