[HeadlessChicken]

A few weeks back, I bought a WA Prokiller MkII F5 from 808. Worked great with what little propane was in there. Only recently I got a tank of propane and found every time I try to fill it up, all the gas escapes out the other end. I figured maybe repair or parts replacement was needed so I'd leave it for later and get another mag anyways. New mag came in today, same issue when I tried to fill it up with propane, it all gassed out the opposite end. Right, I doubt I got a 2 lemons here. I'm guessing I'm doing something wrong here and google hasn't produced any results other then sales pages. I couldn't find a manual anywhere either, didn't come with 1 or even online.

Any recommendations on where I could find a solution or has anyone run into this problem. I'll be trying other google searches under different wording.