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Old 09-29-2013, 04:21 PM   #1 (permalink)
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Single shot won't cycle /reset

Hi guys been awhile since I played pb. Just got back from an overseas assignment.

Anyway, I played last week with my AT4 initially it was fine then middle of a game the marker stop cycling on single shot.

I broke it down clean n lube everything and still the same. Check guide plate still perfect. Mags chain runs freely , what else could be the problem?

FYI I had this marker more than 4 years and has run flawless until now.
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Old 09-29-2013, 06:10 PM   #2 (permalink)
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Check that the one of the fingers on the chain is lined up with the little slot cut on the side of the magazine. I thought I had the chain on right one time and it was just like a link or two off and it was causing some unreliability.

Did you mark the position of the regulator screw? Maybe it backed out some over time?
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Old 09-29-2013, 09:37 PM   #3 (permalink)
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Mags work fine on my other AT4. Yep reg is flush and line up with the marked on the AT 4 body.
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Old 09-30-2013, 02:07 PM   #4 (permalink)
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Does it stall out just stop firing altogether? I'm not sure if this would help but when I put my marker back together sometimes it just refueses to fire and cycle, the reset switch wouldn't work but had an air leak aswell. I had to turn the reg down 1/2 a turn then connect the air and turn it back 1/2 then it would work. I think there is a section in the manual for dead reset switches that I found it on.

Last edited by ragu; 09-30-2013 at 02:13 PM.
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Old 09-30-2013, 07:51 PM   #5 (permalink)
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It stops then I reset it will fire one shot and stop again.

Btw is gumby still repairing at4s?
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Old 09-30-2013, 08:30 PM   #6 (permalink)
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Check the hammer assembly. Specifically the striker spring. I think I had similar symptoms a few years ago and the spring was missing.
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Old 09-30-2013, 08:32 PM   #7 (permalink)
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Gumby is still doing repairs, but ATS is closed.

Check your trigger pawl. Mine went wonky and was causing similar issues.
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Old 10-01-2013, 11:29 AM   #8 (permalink)
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It could be either a broken striker spring or a gummed-up striker.

A side note: the regulator screw should be about 1/4 to 1/2 turns below flush, and can be safely turned in another 1/2 - 3/4 turns. After you turn it further the spring can become crushed after it reaches it's 'solid height'. This will weaken the spring.
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Old 10-03-2013, 04:46 AM   #9 (permalink)
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Thanks guys will try each advice.

@Gumby

In case I'm unable to repair my AT4's can I send it to you? I do have some extra parts if needed. I also want my other AT4 to have a tune up.
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Old 10-03-2013, 11:47 PM   #10 (permalink)
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Yes and I have pretty much any standard spare part that may be needed.
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