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Old 01-18-2012, 04:44 AM #1
Castro #66
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Let's build (or disassemble) a pump gun!

I know there are many out there having trouble figuring this out, so I built this thread in my free time this evening. I know, my phone's camera wasn't the best choice.

We're going to start from the beginning:


First, we'll throw in the valve. This often requires a 'Cocker/Sniper valve tool, though some have gotten away with simply using a 1/4 allen key. Assemble the valve, spring and jam nut as shown:


Then cram them in there, like so. Thread the jam nut in most of the way so the valve opening appears as shown.


You may need to use another tool to line it up.


Next, collect your valve retainer and a 5/16 allen key and tighten it into place.


When it is tight, cinch the jam nut as well. It should look like this:


Next, locate your hammer and cocking rod. Threading them together will make the hammer much easier to index for the next step.


Slide your 1/8 allen key into the hole at the top of the body as shown, and wiggle the hammer a bit to seat your tool into the hammer lug.


3-4 turns in will usually do the trick, though it will depend on the frame and hammer you use. This is a good depth to start.


Next, grab your main spring and IVG and drop them in. Almost all IVGs have a "cupped" side that goes in first to hold the spring in place.


This is the farthest "out" the IVG can be for most guns. Roughly two threads.


At this point you'll want to install your pump kit. For those with secondary guide rods, I get them roughly hand tight at this angle and use a tool to cinch them up. Slide your handle into place and make sure the pump arm doesn't rub on the body.


Hopefully you haven't lost your backblock, bolt, bolt pin or cocking rod by this point! Add them, your trigger frame and other parts as desired. Make sure that you install your bolt with the hole downward.


If adding an autotrigger as seen here, you will likely need to tweak your hammer lug just a bit, but that's a demo for another thread!
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Last edited by Castro #66 : 01-18-2012 at 05:00 AM.
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Old 01-18-2012, 08:55 AM #2
L4sT_ReSOrT
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Great guide for beginners!
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Old 01-18-2012, 09:52 AM #3
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Awesome job, i think we need a tuning sticky thread as well.
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Old 01-18-2012, 10:03 AM #4
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Haha! you took my idea Pump Master!!

I was going to do this when my new springs come in.
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Old 01-18-2012, 04:01 PM #5
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BMX, there is a sweetspotting guide in the Stickies.
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Old 01-18-2012, 04:32 PM #6
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You should just recommend the CCM springs as those are really the lightest springs available and they have been tested by CCM.
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Old 01-18-2012, 04:39 PM #7
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I would, but I simply can't. They aren't perfect for everyone, after all.

Good eye, though. These are CCM springs.
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Old 01-18-2012, 07:44 PM #8
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i was talking more about setting cocking rod lenght, hammer lug depth/ AT trigger tuning, and also reg pressures. it would be nice for it to be all in one place.
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Old 01-18-2012, 07:52 PM #9
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Sure, but I've only got so much time in my evenings.

Trust me, all of those things are available, and I'd rather not step on others' toes at least until I get a better overall method.
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Old 01-27-2012, 01:14 AM #10
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Very Helpful subscribed!
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Old 02-29-2012, 11:00 AM #11
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Your a genius sir great tutorial wish everyone on this forum with a cocker saw this answer a lot of stupid questions excellent work best one ive seen
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Old 02-29-2012, 11:41 AM #12
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Quote:
Originally Posted by PaulE2Cocker View Post
Your a genius sir great tutorial wish everyone on this forum with a cocker saw this answer a lot of stupid questions excellent work best one ive seen
I don't know about genius, but he is a certified master airsmith.

He's also an all around pretty smart guy.
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Old 02-29-2012, 11:49 AM #13
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i want to make one on how to make your own half/midblock arm just have to find my camera.. and start on next project
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Old 02-29-2012, 11:51 AM #14
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whats the rubber lookin piece after your jam nut on valve tool is that supposed to be installed none of my 4 cockers have that...
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Old 02-29-2012, 12:08 PM #15
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Quote:
Originally Posted by PaulE2Cocker View Post
whats the rubber lookin piece after your jam nut on valve tool is that supposed to be installed none of my 4 cockers have that...
Part of the Valve Tool.
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Old 02-29-2012, 05:56 PM #16
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Quote:
Originally Posted by Zepulkinator View Post
I don't know about genius, but he is a certified master airsmith.

He's also an all around pretty smart guy.
You know what they say about flattery...
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Old 02-29-2012, 06:17 PM #17
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You know what they say about flattery...
No, I don't. What do they say about flattery?
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Old 02-29-2012, 07:46 PM #18
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Oh, well then I should warn you, I don't have a lot of spare room in my pants...
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Old 02-29-2012, 11:09 PM #19
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very nice thread btw.
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Old 03-01-2012, 12:56 PM #20
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Eeew...
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Old 03-05-2012, 10:43 PM #21
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Yes, great thread! We'll be looking out for the rest...since you already started it.
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