Classic Automag Problem.

[steve_81]

My Classic Automag with Lvl. 7 bolt airs up fine with no leaks however when I pull the trigger it starts leaking down the barrel. If I hold the trigger back the leak stops. I've changed the powertube o ring twice with brand new o rings but the problem still continues. I've even tried different size powertube spacers. It came with the .220 spacer installed, I tried the .215 and the .225 spacers with no luck.

The marker continues to leak down the barrel. I am thoroughly confused and frustrated with this marker. What should I be looking at next?

[Darring D]

If it stops when you hold the trigger then the on/off is working and it should be in the powerrtube. I'd try adverse different sizes until it stops. Also remember to oil before use.

[athomas]

How old is your setup? Is the sear worn at the tip where it catches the bolt? Have you changed the bolt spring? Also, check to see if the rail bushing is in place.

When you mention that it starts to leak when you pull the trigger, do you mean it starts to leak as you apply pressure to the trigger, or it starts to leak after you take a shot?

[steve_81]

How old is your setup? Is the sear worn at the tip where it catches the bolt? Have you changed the bolt spring? Also, check to see if the rail bushing is in place.

When you mention that it starts to leak when you pull the trigger, do you mean it starts to leak as you apply pressure to the trigger, or it starts to leak after you take a shot?

The bolt spring has been changed to a brand new one and the rail bushing is in place. As far as the age of the marker I'm not quite sure as I recently purchased the marker from someone on Mcarterbrown.

sorry if I wasn't more specific but I can air the marker up fine with no leaks. It fires on the first trigger pull but as I release the trigger after the first shot it starts leaking out the barrel. Pull the trigger back it stops, release it and it starts up again. I'm assuming it has to be the sear at this point.

As I have ruled out the on/off and the powertube o ring. I was going to make a video of the problem for you guys but i've been trouble shooting it all morning and i am all out of air now.

[Spider-TW]

Either your on/off pin is too short for your setup and your sear is not catching the bolt before air hits the chamber, or your bolt is being caught correctly and your power tube is leaking.

Make sure you don't have paint or coating between your rail and body, and your field strip screw is snug. Make sure you have your rail bushing in place.

After my pump mag settled in, it would leak a little hiss with pressure on the trigger, but worked otherwise. All I had were .220 spacers, so I cut one down. I figured I would go down by .010 and use a ULT spacer if I wanted to come back up. I landed .008 for a spacer length of .212. That has been working great.

[athomas]

sorry if I wasn't more specific but I can air the marker up fine with no leaks. It fires on the first trigger pull but as I release the trigger after the first shot it starts leaking out the barrel. Pull the trigger back it stops, release it and it starts up again. I'm assuming it has to be the sear at this point.

It does sound like the sear. Check it to see if there is noticeable wear at the tip. As mentioned, you can shave down a powertube spacer to a shorter one. It should correct your problem. If the sear tip is rounded, you'll get full auto bursts but if it is worn and still sharp the shorter spacer will work for a while. Once the hard surface is worn off a sear, it will continue to wear at a faster rate if that is the problem.

[steve_81]

Thanks for the help on this guys. I have a sear as well as an on/off pin in the mail. Hopefully this corrects the problem. I will report back once everything is installed.

[steve_81]

New sear and On/off Pin did nothing. The leak is still there. I am getting tired of this marker. It will not stop leaking from the barrel. It will be going up for sale shortly.

[Spider-TW]

Is your power tube welded to the valve body? If not, could it be leaking?

[athomas]

If the weld was the problem, it would be leaking all the time. I would go with a shorter powertube spacer. Use your shortest one and take a few thousands off it. Lay a piece of sandpaper on a flat surface and rub the end of the spacer across it (one end only) until you get the desired amount of metal removed.

[Spider-TW]

If the weld was the problem, it would be leaking all the time.

The leak in the PT seam would stop with the trigger pulled back. Not that its common in the first place. Perhaps it's un-welded or has been de-volumized before.

[athomas]

The leak in the PT seam would stop with the trigger pulled back. Not that its common in the first place. Perhaps it's un-welded or has been de-volumized before.

Yes, but he previously mentioned that it aired up fine without leaks and only leaked after it was fired. This is more indicative of a powertube oring or spacer issue than an unwelded chamber although anything is possible and the weld certainly should be looked at. It is easy to check.

I would try a really short spacer.

[Spider-TW]

Yes, but he previously mentioned that it aired up fine without leaks and only leaked after it was fired.

Yep, I skipped over that.