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Old 06-16-2012, 03:26 PM   #1 (permalink)
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Air escape n jams in pump after?

So I got a used phantom in. Pump a 45 frame on it and a chi under cocking kit. Everthing works but ever so often when trying to pump fast it hisses air and then stops working. I have to disassemble to work again. The pump strok seems rough when it happens.
My question.
Is this the due tot he ur kit not havi a stable arm and me maybe pumping at an angle? Or is there something else involed here?

Maybe I just need to polish the internals to make it smoother so it flows nicer?
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Old 06-16-2012, 03:52 PM   #2 (permalink)
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Ummm, can you please clarify what you said on the 5th line?
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Old 06-16-2012, 06:01 PM   #3 (permalink)
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About the pump stroke seeming rough? When pumping it seems to have more restance and I almost feel flex for lack of better word in the pump arm.
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Old 06-16-2012, 10:51 PM   #4 (permalink)
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Not sure if it would cause problems, but how far in is your tpc or velocity adjuster?
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Old 06-17-2012, 04:42 AM   #5 (permalink)
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Chrono at 285-90ish. It did stop grabbing the bolt so I lowered zoom and it did better but then again the problem returned
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Old 06-18-2012, 03:03 PM   #6 (permalink)
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Could you break down the phantom and take a pic. I'm curious to see if it's a stock spring and what not. When the bolt stops grabbing, it means the main spring tension is greater than the valve spring and the hissing sounds as though the 12 gram is now exhausting out the valve.

It could just be a simple issue of getting the spring rates efficient for your gun. At least, that's what it sounds like to me.

Also, you can polish the internals (bolt, hammer, valve internals) to help make the stroke smoother.
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Old 06-19-2012, 02:25 AM   #7 (permalink)
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I was planing on polishing the internals to smoth it out some but just got back from deployment n haven't had time settling back in yet.

It looks like stock parts inside. With the stock over cocking handle it didn't do it so I am prone to think its just binding odd letting gas escape maybe. May just swap the uc kit Eventhou I like the feel of this one
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