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Old 07-10-2013, 12:18 AM   #1 (permalink)
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Pro Comp v3 Troubleshooting

Iíve got a VM-68 Pro Comp v3 that Iím trying to get running. As far as I can tell, the gun is cycling properly. However, after each shot, the bolt is not retracting far enough for a paintball to enter the breech.

On my stock VMs, the bolt face is completely flush with the rear of the breech chamber. On the Pro Comp, the bolt protrudes between about 1/8Ē and 1/16Ē into the breech.

The kit was originally installed by Airgun Dynamics, so Iím fairly sure that everything is set up properly. Iím running both the VMís main valve and the Pro-Compís bolt valve wide open. Any ideas?

Also, does anyone have a copy of the Pro Comp v3 manual?
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Old 07-10-2013, 04:51 PM   #2 (permalink)
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I don't think I have the manual, but I do remember trimming my fathers pro-comp bolt. It protruded into the breech as well. I think they did this to try to combat the long cycle of the VM.

I'll see if I can dig up the manual, but I think you are looking at a properly set up V3.
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Old 07-10-2013, 05:00 PM   #3 (permalink)
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Cool. Thanks for the help, Cap.

If that's the case, I've just got to figure out how to get the balls to feed into the breech during the cycle...

Last edited by Giuseppe; 07-10-2013 at 05:49 PM.
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Old 07-30-2013, 04:53 AM   #4 (permalink)
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That doesn't seem right. I just checked, and in my Pro-Comp, the bolt clears the breech when the gun is cocked. Are you sure the kit is properly assembled?
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Old 07-30-2013, 06:39 AM   #5 (permalink)
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Sadly, I seem to have lost my original Pro-Comp manual, else I would have scanned it. But I found an electronic version that I had saved on my hard drive, so I compiled it into a PDF:
https://dl.dropboxusercontent.com/u/...3%20Manual.pdf

Hope it works for you!
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Old 09-19-2013, 07:59 AM   #6 (permalink)
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Just saw that you posted this. Thanks, Mugged!
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Old 05-21-2015, 01:49 AM   #7 (permalink)
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I'm bumping this thread to see if there are any more ideas out there. I've been working on the VM for the last week or two, but it still won't feed. I can manually retract the bolt back far enough to allow a ball to drop into the breech, but there's not enough clearance for one to load automatically after each shot.
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Old 05-21-2015, 08:48 PM   #8 (permalink)
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hammer spring to stiff maybe, hammer oring has a small nick causing blow by, something is blocking the blow back air? just throwing things at the wall..
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Old 05-22-2015, 10:00 AM   #9 (permalink)
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I'd guess there is something off with the sear, the hammer, or the way in which the sear interacts with the hammer - that causes the hammer to engage the sear at a point that is too far forward. But when I look at my own kit, I don't see what the sear would catch on. I guess that technically the hammer could catch on the secondary sear, but the secondary sear should be able to move freely enough to not be able to catch the hammer.

Good luck!
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Last edited by Mugged2Much; 05-25-2015 at 11:16 AM.
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Old 05-25-2015, 11:59 AM   #10 (permalink)
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Thanks, Mugged. That got me pointed in the right direction! I realized that the sear on the VM catches the leading edge of the Delrin portion of the Pro-Comp's hammer. On my Pro-Comp V3 hammer below, you can see that the front of the Delrin hammer has been reinforced (from the factory, I assume...) with what looks like a metal C-clip. You can see the silver spot where the sear has worn through the clip's finish (we're looking at the bottom of the hammer here):



The bolt, however, is attached to the metal part of the hammer, so if that section is too far forward, the bolt will protrude into the breech. When I pulled the hammer out, sure enough, there was a gap between the Delrin portion of the hammer and the base of the metal part. I used a rubber mallet to "coax" the front part of the bolt back, but after only a couple of rounds, it moved forward again (the bolt is in its proper configuration in the photo above, so no gap is visible).

Looking down the from of the bolt face, I can see what appears to be a 12-point fastener head. My best guess is that there's a bolt inside the metal part of the hammer, which is supposed to keep the two sections of the hammer together. If I can tighten the bolt down, that may solve the problem:



So, does anyone have experience disassembling a Pro-Comp? Right now, I'm just going by what I can see. I don't have a 12-point socket small enough to get in there, so it may be time for a trip to the Home Depot...

BTW, if you look at the top photo, you may have noticed that I'm missing a chunk out of my hammer O-ring. Has anybody replaced a Pro-Comp O-ring? Are they made of magic, flat-stock, urethane unobtanium like the regular VM hammer ring, or are they just a hardware store part?
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