RT Problem, Pufft!

[invisableflames]

as soon as i air up my RT mag with LVL 10 it Shoots air out (from the back of the valve i think) in small bursts. just like Pufft. Pufft. Pufft. untill i de gass it agian. what would cause this?

[Dayspring]

Take a 1/8th allen key, turn a 1/4 turn counter clockwise. If that doesn't fix it, replace the reg piston.