[redzaku]

Sounds normal to me, but you can try and "shim" the rubber gas route, there should be a thread on it
on my 1911 co2 model, I found that the nozzle is a bit thicker and caused the chamber to stick and vent gas so get a nozzle for propane guns even I replaced it, I still get about twelve shots, due to the small gas reservoir of the 1911 style