I have an air leak that I can't seem to get rid of...
First let me go over my setup. This is an RT/Pro ULE w/ xvalve, level 10, ULT.
This gun has been heavly used, its probably seen 100 cases of paint and at least that many more dry cycles. Im using the smallest level 10 carrier (no lines, no dots) because the larger ones all leak. Velocity is set at 280, tank output set to 950 psi.
The last two times I played, I noticed a small leak coming from the level 10. Since the gun was still using all of the original orings, last night I decided to fully clean the gun and replace all of the orings in the gun an oil it up. Im pretty good at keeping this thing tuned, oiled, and clean. However, I still have the same leak. The gun still cycles great. It stops leaking if I hold the trigger down but starts again if I let go. I was using the small spring, so I tried the red one and am still getting the same leak (I cranked up the velocity to adjust for the red spring).
My first thought was to check the sear and see if it was worn because pushing the sear forward in the grip frame (effectively pushing the sear up into the level 10 and the bolt backward) stops the leak. It looks fine, no real signs of wear (unlike my emag sear which is very worn and still works fine). This helped me visualize where the leak is coming from... The bolt is sitting too far forward and the vent hole is leaking on the carrier oring. To prove this, I put a .010 shim between the carrier and the plastic washer (the plastic washer I replaced last night too), to hold the carrier closer to the front of the gun. No more leak!
This doesn't seem like a good fix... I don't like the idea of a shim resting against the carrier instead of the plastic washer, they have a larger ID and I'm afraid of what the carrier oring might do... Anyone have any suggestions? What am i missing?
Edit: Rail bushing is in place. I also took the level 10 shims out, that didn't seem to make a difference at all.