| If it's leaking down the barrel, it's the little o-ring underneath the brass tip of the powertube. They wear out about every 2k shots, unless you store it without the bolt in place. I don't remember the size of it, but just take the old one to the hardware store, unless it's been blown out, in which case you might find it stuck inside the bolt.
There's also a tiny o-ring between the valve body and the 'rail' it attaches to. It's easy to lose when you remove the valve body. I've found that dabbing a little plumber's grease on it helps keep it in place.
Then possibly one of the o-rings in the internal reg might be bad also.
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