Pump mag leaking

[wd3d]

Been working on my pump mag, and it has developed a slight leak down the barrel, but only when it is in the fired/bolt forward position. If I cock the bolt back no more leak. I am thinking this is just the spacer o ring, I would not think I would need to change the spacer? I am running a minimag valve.

Here is another question, This valve has a spring in the tube. I never have taken it apart before today, so never noticed it. I looked on the AGD home page and didn't see any reference material for it. Any info would be appreciated

Thanks

[athomas]

If it is leaking after you fire, the wave spring may be holding the bolt too far forward for the spacer/spring you have installed in the powertube. Try a shorter powertube spacer.