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Old 04-07-2007, 06:13 PM   #1 (permalink)
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pump mag not cocking

when pumping, nothing seems to be catching. it's just like pumping my trracer when it's not aired up. nothing happens when the trigger is pulled obviously.

should the pump rod push the bolt back? i'd like to get this up and going for a game here in the next couple of weeks. thank you!
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Old 04-07-2007, 06:28 PM   #2 (permalink)
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ok..... the process is as follows

the pump handle is attached to the pump arm
the pump arm recocks the bolt
the bolt hit the spring washer
this prevents it from becoming semi-auto


make sure the rubber spaces on the power tube base is cut down or the right one, and the spring washer sits on that.

if it still not cocking check the pump rod lenght. it may have been modded or set up for a different mag... good luck
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Old 04-08-2007, 12:13 AM   #3 (permalink)
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loosen up the frame screw a bit, worked for me..and be sure its the right bumper on the bolt
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Old 04-08-2007, 04:58 PM   #4 (permalink)
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okay. thank you for the advice. i'll need to give it a try and see what happens.
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Old 04-12-2007, 12:27 PM   #5 (permalink)
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Your bolt isn't re-cocking all the way.

If you have the black bumper, take it out. (save it)

Get the standard blue bumper, cut it to fit inside the wave spring. This will keep your wave spring centered.

The tension of the wave spring alone should keep the marker from re-cocking the bolt. If it goes semi, carefully bend the waves in your wave spring all around to make more tension (more height), this should keep it from going semi.
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Old 04-13-2007, 01:00 AM   #6 (permalink)
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hey sup brothah, aint seen u round these parts
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Old 04-13-2007, 03:43 AM   #7 (permalink)
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Hey Rudz,

Yeah, I just recently joined here. Just wanting to share some tips w/ fellow Pumpmag owners.
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Old 04-13-2007, 10:44 AM   #8 (permalink)
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Yea only thing it can be in my experience would be the bumper or pump arm as well. My wave spring was so weak that it would eventually lose it's fight with the bolt spring and the gun would return to semi-automatic operation... and with 15 shots from a 12g, I sold it and will use my Phantom for pump play. It's sad really, the pump Mag had a stroke that was as slick as the nicest Sterling...
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Old 04-13-2007, 10:00 PM   #9 (permalink)
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Hey Steve,

I'm the same guy on AO that bought the milled rail and body from you.
Left you good feedback. Can you do me a favor and return feedback for me on AO? I'll PM you the link.

Your parts will now be used for OSC and NSA tournaments: my next PumpMag project.

It's true though that the wave spring loses tension after a lot of use and will eventually come apart. I've replaced 3 in the past 2 years. Anyone know where to get more of these?
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Old 04-14-2007, 10:07 PM   #10 (permalink)
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from Haveblue: "The wave spring is about 0.93" OD, 0.737" ID with a free height of approximately 0.2" and a compressed (solid) height of approximately 0.04". The spring is made of three turns of 0.094" wide, 0.012" thick strip. The closest match from Smalley appears to be the C100-M1, with availability here: Smalley Steel Ring Co. Retaining Rings, Snap Rings and Wave Springs - Index"

Generally requesting the free samples will get you the one you need.
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