Ok so here is the deal. I have a Rap4 air-thru car stock. When I put it on my gun my air leaks thru the internals in the gun. You can hear air coming out of where the ball goes into the marker thru the cyclone. Now I have taken it off and put my original ASA on along with my old CAR stock and then gassed it up. No problem. It is only when the AirThru CAR stock is on that the gun leaks air thru the gun. Does anyone know what would cause this? I tried replacing the tombstone that came with it, with a new one but that didn't help any. Since the marker works fine with other stock and ASA I figure it is not a problem with my internals(even though I just replaced all of them anyways) I called RAP4 and they told me to try and dip the stock into a bucket of water to see where it is leaking when the gun is gassed up. I did and saw no leaks....Anyone have any ideas?

Sounds like the stock is putting to much pressure on the drive spring and pushing the hammer on to the valve. you could try a lighter drive spring.Did you cock the marker before airing up?If not give that a try and see what happens.

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a bad day paintballing is beter than a good day at work!!!!

I will try both!! Thanks Bow!!! I will let you know if it works!