[Drakker]

First, give the big o-ring a long silicon oil bath. Second, when you reassemble it, don't tighten it too much, or the nozzle will not be able to move enough to let the gas pass. I had two of these and I had to give the o-rings regular silicon oil bath or they would just dry really quickly and gas would spray everywhere. The o-ring doesn't like cold at all... and every time you fill a mag the o-ring gets cold, I will let you do the math.

I since bought an AI plastic propane adapter, never had a problem with it, and never used the MadBull again.