Originally Posted by WMine
Could it be the o-ring on the base of the bolt?
Still leaks down break. REALLY fast leak and loud.
No, it's not the bolt. A barrel leak is either the poppet/valve assembly or solenoid. Make sure to clean off that poppet face and make sure it is dry with not a single daub of grease on it. Try resetting the poppet and solenoid as per the manual. What kind of battery are you using? Brand new Duracell? Is the solenoid clicking?