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Old 11-02-2012, 01:17 PM   #1 (permalink)
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2K2 WGP Pump blow back

I have a 2K2 WGP Pump and when i shoot it the lid pops open on the hopper not all the time but some. I tried replacing the o'rings on the bolt and that helped a little but it still pops open. Any suggestions?
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Old 11-02-2012, 01:19 PM   #2 (permalink)
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Does the same happen if you are holding the pump forward as you fire?
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Old 11-02-2012, 01:23 PM   #3 (permalink)
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No if i hold it forward it doesn't do it but is louder
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Old 11-02-2012, 01:26 PM   #4 (permalink)
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Sounds like the bolt isn't closing all the way. Try a spring return on the pump.
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Old 11-02-2012, 01:27 PM   #5 (permalink)
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ll try that thanks
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Old 11-03-2012, 10:46 PM   #6 (permalink)
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Be sure to chrony it while holding the pump forward for an accurate reading.

sounds like the bolt moves back when firing and air is directed up the feedneck.
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