Originally Posted by MstrKey
Does the sail oring fit loose? If so you used the wrong size.
Now the large outer can orings also hold air from the noid/dump chamber. There is a set of three of them together. If any of those leak you'll also get air coming out of the noid. Swap those out if you haven't.
If that doesn't help then I suspect your LPR may have a leak on one of the LPR body orings. You can swap some of those out too.
Your other possibility is to take the grip off......disconnect the wires first, then unscrew the grip frame from the body of the gun. Then air the gun up with the grip frame off and see if you can better locate the leak. Be careful not to rip any wires!
as he said, its best to pull the grip frame apart and see exactly where it's leaking it could be the LPR or the noid area. If you dont want to deal with it look at my sig for a cheap service