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Old 02-24-2008, 05:56 PM   #1 (permalink)
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Mag pumps: how do they work?

I know that the bolt resetting on a pump mag is still the same as on a normal mag, and that the pump is simply to manually "charge" (or work the on/off) the valve. What I want to know is the internal workings with a pump mag firing cycle. Just what is actuated HOW in the firing cycle by WHAT?
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Old 02-24-2008, 06:22 PM   #2 (permalink)
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I recently was learnt this by ajnin. Basically there's a 'wave washer' that replaces the urethane washer between the bolt and dump chamber that prevents the bolt from fully re-setting. All cocking does is push the bolt back a little farther, compressing the wave washer and letting the sear latch it.

When you pull the trigger, it thinks it's a standard Mag, except the bolt doesn't go fully back and re-set.

It seems kinda backwards to do this, but people do.
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Old 02-24-2008, 06:31 PM   #3 (permalink)
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"Bolt Stick"

Basicly just as Hurtcow said. You intentionally make the bolt not able to reset all the way. When you pump the gun your pushing the bolt back the last teeny tiny bit enabling the gun to fire again. Everthing else internal to the gun operates the same.

It's very ***-backwards but is a fun gun to shoot.

Here's a bit more info: Linky

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Old 02-25-2008, 04:17 AM   #4 (permalink)
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i love telling people that i kill them with a broken gun
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Old 02-25-2008, 11:42 AM   #5 (permalink)
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I wonder, would it be possible to make a pump mag that is closed bolt, not blow forward? Maybe remove the front spring entirely, keep that wave spring behind the bolt like a return spring, and tweak the valve a little?
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Old 02-25-2008, 11:56 AM   #6 (permalink)
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I wonder, would it be possible to make a pump mag that is closed bolt, not blow forward? Maybe remove the front spring entirely, keep that wave spring behind the bolt like a return spring, and tweak the valve a little?
Nope

A mag is a dump chamber style marker. The bolt is an integral part of the system, thats what keeps the dump chamber shut before you shoot. And there really isnt a good reason to make it closed bolt, the whole closed vs open bolt controversy has been proven to be false, they both shoot the same. If you really want a pump mag closed bolt, go buy any nelson pump gun............
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Old 02-25-2008, 12:08 PM   #7 (permalink)
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That wave spring isnt that large... what you are suggesting is not possible.
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Old 02-26-2008, 11:05 AM   #8 (permalink)
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i love telling people that i kill them with a broken gun
As ajnin said... it's been explained to me as basically a "broken" mag with a "manual fix."
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Old 02-26-2008, 11:36 AM   #9 (permalink)
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So the pump is not permentantly connected to the bolt?

Just curious, as some pump tournaments specifically state that the pump is supposed to be directly connected to the bolt. I imagine this is to ban pump-assist snipers.

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Old 02-26-2008, 11:38 AM   #10 (permalink)
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Imagine a typhoon with a pump kit with the semi still turned on, but LPR not set hot enough to cock the hammer, that, with exception of where the cycling is occurring, is a pump mag.

with how fast pyres and ccms are these days it barely matters anymore.
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