Tac one auto firing

[epl]

I bought the gun not too long agon. I went out back and started shooting. I got about 300 balls through, then I reloader and then the gun started to auto fire. It does this everytime now untill I let go of the trigger. Any suggestions?

[Ruler_Mark]

ULT?
sear condition?

[epl]

I had a ULE installed, I took it out and installed the original valve. It still does it.
What about the sear?

[epl]

I checked the sear and didnt see anything that stands out. Is there any adjustment that I should be aware of? and if so, how to do it?

[flyingpootang]

I checked the sear and didnt see anything that stands out. Is there any adjustment that I should be aware of? and if so, how to do it?

Your on/off pin is too short put back in the ULT minus 1 shim that should cure your problem...

[epl]

I put the ULE on again, I took a shot, the gun auto fired. I took one shim off like you said.
The gun not only did it auto fire but the trigger did not come back out, it stuck there shooting.
My observation is that, when I first got the gun, i shot a couple rounds. It shot fine with no
problem. I then purchased the ULE and installed it, shot it and shot fine. I then proceeded to shoot around 300 round then it started to hiss then it started to auto fire, ever since it has not stoped.

[athomas]

Clean the on-off area. It sounds like the orings are not sealing properly. This could be a piece of dirt.

Check to make sure your rail bushing is in place. Without it, the valve could have changed positions with all sorts of strange consequences.

[epl]

I took out the seals and cleaned them, oiled them and installed them. same problem

[athomas]

There are only three places that air can get into the front chamber to cause the gun to fire while the trigger is held.

The main path is past the regulator valve piston assembly where it goes through the regulator seat oring and then through the hole sealed by the on-off pin. When the trigger is held, the on-off pin seals this path. The only way the air can enter through this path when the trigger is held, is if the oring is bad or the pin is too short. The short pin can be a broken pin, the wrong one, or something that is not assembled correctly to give the same results.

The second path is past the regulator seat oring and then past the regulator valve pin oring. The air would feed through the regulator valve piston assembly directly into the front chamber. Normally air flows the other way to provide pressure regulation. For air to enter through here, the regulator valve pin oring would have to be leaking.

The third path is past the two orings on the end of the regulator valve piston assembly. These orings are separated by a plastic split washer. For air to enter here, both orings would have to be bad or have a large piece of debris that was interfering with the seal of both orings.

[epl]

Ah, very interesting. I got off the phone with AGD about my issue. I was adviced to check the tightness of the thumb screw, to get a little tighter with a wrench, I tried the hex tool. I tighten the screw and nothing changed. The personel also adviced me to change the seating o-ring for the regulator valve with one of the seals from the level ten kit. I went ahead and changed this o-ring. To my amusement, The gun shot fine. I went out back and shot about 400 rounds with no problems. I have to admit. The customer support from AGD was right on. It took the guy literally 1 minute to answer me back after I told him the gun was auto firing when holding the trigger down. He knew right away. Awsome!!. But Im really impressed with your knowledge, athomas, you were right. I have to give you props too. I had the problem on friday and no customer support from AGD until today. I was about to loose it. I spent numerous hours looking for help online and looking at diagrams from the x-valve and trying to understand the gun. I did not want to start replacing o-rings when the gun is a month old, But someone knew more than I did. Im just glad the gun shots fine. I fell inlove with the gun the minute I first shot it. Thanx again guys

[athomas]

Good to hear you got it working.

I learned early on, when I had my first 68 Automag back in 1993, that you sometimes need to look at the none obvious. During my second time out with my new mag, it started acting up. I was hesitant in changing orings on a new gun. It should work right? It actually wasn't an oring, but a piece of sand causing the regulator piston assembly to stick. This caused velocity issues from too hot to the ball barely making it out the barrel. It made my day of play very unpleasant until I found the problem, but I learned a lot about my mag and how easy it is to troubleshoot once you understand how it functions and where the air passages are.

[Tbuck]

Good to hear you got it working.

I learned early on, when I had my first 68 Automag back in 1993, that you sometimes need to look at the none obvious. During my second time out with my new mag, it started acting up. I was hesitant in changing orings on a new gun. It should work right? It actually wasn't an oring, but a piece of sand causing the regulator piston assembly to stick. This caused velocity issues from too hot to the ball barely making it out the barrel. It made my day of play very unpleasant until I found the problem, but I learned a lot about my mag and how easy it is to troubleshoot once you understand how it functions and where the air passages are.

If you go on youtube and search Tom Kaye it will bring up a very informative series of videos about automags. Granted it is very dated, alot of the troubleshooting techniques still apply to todays mags. Check it out and I'm sure it will help you in the future.