just tuning up my VM68. it was firing fine, but after replacing all the internal o-rings it wont re-cock after firing the first shot. after the first shot (approx. 280 fps) it rapid fires, like a 98C does when its running out of air.
check the hammer o-ring . . . and check the velocity adjuster on the bolt - it it is between clicks it can cause problems
lack of proper lubrication can cause the full auto trick also. Lube is your friend :)
did you replace the hammer oring with a standard round rubber o-ring? the hammer o-ring groove is deeper than normal on many of the early VM's (possible later ones also: not sure) and takes a special rectangular oring that is taller than normal. if you don't have that, the hammer will not seal properly and you'll get the full auto shootdown you describe.
i tried 2 auto parts places and the local paintball shop where i volunteer my services.
WHERE do i get a few replacements???????
i lubed the snot outta the old one with DOW33 and oil, and i managed to crack off a few shots before the full-auto effect took over.
i will be madly out-sourcing these o-rings. i wanna keep shooting this beast. i just picked up a stock for it and was gonna mod it to fit, but i aint gonna bother unless i can find some hammer o-rings.
You could try running liquid Co2:eek:
One of mine loves it:D
-as stated really lube the snot out of the upper and lower areas I had the exact same prob because it wasn't lubed enough.
Technically, it doesnt really fix the problems, but hide them.
As mentioned above, its probobly just a bad/missized oring, but the trigger could also be wonky.
vmempire has a great breakdown for the trigger. This is a small spring that usually gets missed whenever it is reassembled, causing the f/a problems.
Other things to check: bad detent. Sometimes the bolt will "pinch" it, and add friction.
Wrong size valve screws that push against the valve stem.
Worn main spring (try adding spacers behind the main spring).. I think dimes fit?
$19.95 gets you ALL of the seals from American Paintball
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