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I recently replaced the cup-seal and o-rings on one of my VM's. Before the replacement, it was venting pretty badly down the barrel -- pretty clear cup-seal problem if you ask me.

Well, I replaced the cupseal and bolt / hammer o-rings. Everything looks okay -- no buldges or seams on the rings. Added some light lube and started to test.

When I gas it up, it holds the air just fine. When I fire it, it sounds like it goes "full auto" for about 3 seconds, then stops. I re-cock it...fire...full auto again. The sear is the same exact height as before...all I did was replace some o-rings and seals.

I was using a full 9oz tank at the time...so it's not necessarily an air issue.

I'm going to break it down again tonight and re-assemble (just to make sure that neither of the valve retaining screws are intruding on the valve spring.

any ideas out there?

thanks

what6 position is your valve in (what position is the dimple)?

is the hammer o-ring good? and the proper one?

i'll be home tonight if you need to give me a call

right now it's set to 12 o'clock (big hole). I believe that the bolt adjustment is set to half.

The o-rings all look good to me. No slack, no dimples or seams. They have a nice tight fit.

I have no idea how old the bolt spring is, but it seems to be in great condition.

I just have to break it apart again to make sure that nothing is wrong...

I'll post more after I test it again

thanks!

Well, I took it apart again. This time I adjusted the bolt velocity screw to roughly half-way and set the valve adjustment to 6 o'clock. It cycles just fine now...but I have no idea what it's FPS it's set to

Once I'm done installing the bottom-line adapter and female stabe, I'll open the valve and bolt so I can just use the stabe to control velocity. It's a royal pain to adjust VMs any other way!

could be a couple things, one is the bolt spring or bolt Oring, or bad cup seal spring, i have a few of each if you need.

_________________
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote."

Thanks! I have a few o-rings left...so I should be okay for now. It cycles fine now, but I haven't shot any balls through it to gauge the FPS it's set to.

I have a few parts from Cooper-T due in early this week. After I get the bottom-line installed, I'll be able to run 20oz on it. All of my smaller tanks are empty -- but I have quite a few full 20oz's