Quote Originally Posted by athomas
No, this is not normal. The regulator seat oring prevents the bottle pressure from getting into the the chamber. If this oring isn't working properly, you will probably experience air venting out the back due to overpressure in the chamber.

Does the mag stop firing when holding the trigger after a shot? Make sure you have the rail bushing installed when you put the mag back together.
It never stops firing after pulling the trigger until released, and ocassionaly it vents air. It will either vent air or just become full auto, untill i reseat the oring back into the regulator.