Classic with L10 going full auto

[millsan1]

OK, I know a little about Mags. This is my second.

It is a classic, and I have put an L10 on it.

When I air it up and hit the trigger, it goes full auto. This is not bounce, it is runaway.

I have done the following:

Cleaned and oiled the whole valve, pins, trigger, etc.
Installed the stronger spring.
Checked that all o-rings, etc are there.
tried different tanks (all HP preset)

There are no leaks.

I am at a loss at this point and would appreciate any useful suggestions.

[millsan1]

Sorry, I also checked the sear and it is not worn at all

[ManInBlack]

I'm bringing this back because I'm having the same problem. I tried to install a LVL X in my classic pnuemag today and it started doing this full auto thing. Just before installing the LX I took the valve apart and checked everything out, including the on/off (probably not such a smart move in retrospect, but I wanted to make sure everything was clean. I tried a couple different springs and carriers and was about to write it off as a problem with the LX, but I put the L7 bolt back in and it's doing the same thing. Is this an on/off problem? Time for a rebuild kit?

[secretweaponevan]

I'm bringing this back because I'm having the same problem. I tried to install a LVL X in my classic pnuemag today and it started doing this full auto thing. Just before installing the LX I took the valve apart and checked everything out, including the on/off (probably not such a smart move in retrospect, but I wanted to make sure everything was clean. I tried a couple different springs and carriers and was about to write it off as a problem with the LX, but I put the L7 bolt back in and it's doing the same thing. Is this an on/off problem? Time for a rebuild kit?

On/off problem. Most likely the on/off top o-ring. It could be the urethane o-ring also. OR.... you might have put the on/off pin in upside down . Remember, the groove in it goes towards the frame, not up(down) in the center of the valve.

If you hold the trigger and it leaks (in this case severely) you have an on/off leak.
If the marker is resting and it leaks, it is a powertube/carrier/shim leak.

Soak those puppies in autolube overnight and try again.

Good luck.

[xero28]

I had a similar problem when put my classic valve in my MicroMag. I have an RT on/off in there and I had shaved down the pin to get it to work in a classic body/rail that I'd modified a bit. I didn't shave it too much, but just enough so that when I put it in the micro, if you pull the trigger about 1/2 way down, it would start auto firing. If you pulled it all the way down though, it would fire correctly. After asking around on the forums, I found that because I'd shortened the pin, that shortened the distance the pin could push the sear back to catch the bolt. So the sear was just barely catching the bolt, and just a tiny pull of the trigger would set it off, and if you held it to where the sear wouldn't catch but the pin would close the on/off, you get full auto. I just ended up just getting a new on/off pin that is the correct length and haven't had a problem since.

Do you have an RT on/off or classic? Secretweapon may be correct, it may be the o-ring. But you may want to check and make sure the on/off pin isn't bent or anything. That could limit the distance it can move and push the sear. Lube it up and make sure it moves freely in and out of the on/off so it can push the sear to where it needs to be. Also check that the sear is seated correctly and can move freely in the rail. If it is not seated correctly it could rub up against the sides of the slot it is in and not be able to make it back to catch the bolt.

Good luck. I'm pneuing my classic as well and am loving it. Haven't been able to fully test it yet, but I am so itching to do so.

[ManInBlack]

The pin was in upside down...

[secretweaponevan]

Glad to help!

[xero28]

The pin was in upside down...

Great, you couldn't have let me know that BEFORE I wrote a dissertation on on/off pins

[secretweaponevan]

Great, you couldn't have let me know that BEFORE I wrote a dissertation on on/off pins

Hehe, and I just added the upside down part after I broke down the 2 most common leaks. It was a, "nah, it couldn't be that easy" moment. :)

[ManInBlack]

With me, it apparently can be that easy...

[secretweaponevan]

With me, it apparently can be that easy...

As long as you understand the physics as to why it went full auto we can pass the torch on to you. :)