On/Off Sticking

[some_guy]

So, building my first automag, and running into a bit of an issue. It's got a classic valve. It wasn't firing right, so I took it apart, cleaned it, re-lubed. Still wasn't working right, so I started replacing orings. Now, it will fire once, and it appears that the on/off pin is sticking (the trigger pin from the sear is not returning). It is re-cocking however. With the pin stuck back like this, sometimes it might leak a little, or giving it a light tap with the trigger will cause it to fire again. And sometimes, it will fire once on trigger pull and once on trigger release. When it's stuck, I can de-gas the marker and re-air it up, and it resets fine.

Anyone have any advice on how to pursue this issue? I'm using an automag parts kit for the orings, but it might be older, and most of the orings are pretty firm, even after oiling (I'm wondering if trying a new one directly from agd may help). My focus has mainly been around the on/off assembly, but could I be looking in the wrong place?

[vintage]

sounds like a slow recharge, what input pressure are you getting from the tank?

[BiNumber3]

I was thinking a possible over-tightened thumbscrew too.

[blackdeath1k]

First automag? Input pressure is my first thought. Although they should cycle below 800psi. I never had any luck at all with them firing right below 850. And they didn't cycle right from a little over 700 and down.

[some_guy]

Thanks for the replies- Input pressure from two different tanks, one is 750ish, the other is 800 (and both are not having issues on other markers).

As for the thumbscrew, I had just hand tightened it in, but will double check it this evening.

[some_guy]

Just saw the reply from blackdeath1k as well- I'll double check my other tanks tonight too and see if I can find one that's outputting at around 850 or so.

[blackdeath1k]

Mags like higher pressures. 850 is a reliable running pressure. If you have issues at 850. Then you have a marker issue.

[some_guy]

Just checked with two tanks, one at about 800 and one at about 850, and the issue persists. Also pulled out the regulator piston, cleaned the chamber, changed the oring, re-oiled, and the problem persists as well. Tried with backing out the thumbscrew a couple of turns as well, and the issue persists. Any ideas on what to check next?

[vintage]

try turning your velocity up, also make sure your actually getting 850 to the marker somehow.

[vintage]

also make sure your pin is absolutely clean. I've had problems with old o rings leaving residue on the pins.

[some_guy]

With how my reg tester is set up, it's getting the actual psi at the tail end of the foregrip, that's the best I can test at the moment. Also, the pin is clean- before I had posted, I scrubbed it good as it was binding from residue. But, issue is still there

[blackdeath1k]

I may have overlooked it. But have you put a full Oring rebuild kit in it? As they age they get stiff. That could cause drag as well.

[some_guy]

Yep, have replaced every oring I can find. Note, I have NOT touched the large screw in the washer (I seem to remember in a video them saying not to touch that), but who knows, could've been messed with before I got it. I'm wondering if the o-ring kit I got has been sitting on a shelf for the past decade+ and dried out too much. The orings are noticeably stiffer than the ones I'm replacing.

[BiNumber3]

What kind of body is this installed on?

[some_guy]

Gearheadz Helios body