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Old 06-28-2011, 11:49 PM   #1 (permalink)
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Pump mag issues

Alright, so I just recently threw together a pumpmag. One big problem. It is a pain to cock. The stroke is smooth as could be, but when it actually comes to pushing the bolt back onto the sear it becomes a real task. Also, it takes the ENTIRE pump stroke to cock it. Like the return spring is smashed together when the sear catches. Any ideas?
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Old 06-29-2011, 12:05 AM   #2 (permalink)
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Never messed with one, but is your pump rod too short? If it's adjustable, you might back it out a few turns and see if that helps.
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Old 06-29-2011, 12:09 AM   #3 (permalink)
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bumper behind the bolt to thick?
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Old 06-29-2011, 12:14 AM   #4 (permalink)
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Sanded down the bumper a good bit. That helped a very small amount. Honestly, it just made it so that it could for sure be pumped every time. I have back out the rod and that didn't help a ton either. Main spring is also unclipped.
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Old 06-29-2011, 12:38 AM   #5 (permalink)
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Classic valve, stock mainspring, wavespring, flipped oring/carrier within powertube, bolt is clean, rod isn't binding/getting caught?

Should be able to do what I can in my video
http://www.youtube.com/watch?v=1s8hyTPSt_A

Pictures of your setup?
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Old 06-29-2011, 12:43 AM   #6 (permalink)
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I'll get pics tomorrow. Maybe I missed a step, what do you mean by "flipped oring/carrier"?
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Old 06-29-2011, 12:45 AM   #7 (permalink)
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I'll get pics tomorrow. Maybe I missed a step, what do you mean by "flipped oring/carrier"?
Within the powertube, you swap the carrier and the oring when you run a pump mag. No necessary, but I find it to be a nice touch.

You might need to clip your mainspring, it may be too strong.
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Old 06-29-2011, 12:55 AM   #8 (permalink)
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Not that I think your wrong, but how would clipping the mainspring make the stroke lighter
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Old 06-29-2011, 01:00 AM   #9 (permalink)
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Not that I think your wrong, but how would clipping the mainspring make the stroke lighter
It's for a different purpose, I figured while we're trying to diagnose problems, take care of usual ones.

Pump stroke could be several things as of right now.

People tend to wear out their wavesprings really quick because of the mainspring being too strong (completely separate thing tho).

Now that I think about it, is your bumped sized with the wavespring?

Double check and make sure everything looks kosher to this
http://haveblue.org/tech/automag/index.html
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Old 06-29-2011, 01:10 AM   #10 (permalink)
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haveblue isn't wanting to load for me right now. Though, I figure I should have mentioned this earlier, I am still running the green stock bumper. I have seen people talking about putting the bumper IN the wavespring? I don't really see how that would work, but maybe you have some insight. If I try just the wavespring the pump arm does not reach the bolt.
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