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Old 09-20-2008, 04:50 PM   #1 (permalink)
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tuning pump stroke on snipers

I just got a new pump gun in this weekend. I don't have much experience with pumps other than the 1 phantom that I've had for the past 2yrs and only used once. I got an 06 blackmagic with a ccm pumpkit and ccm AT frame. Keep in mind that I have not shot other snipers before, but from watching youtube videos and other vids of pb forums it looks like some people have figured out how to really lighten (possible shorten) their cocking stroke. I like to tinker with stuff and try to get every ounce of perfection I can get, but I didn't want to start from zero.
So, mainly because I'm bored and, like I said, I feel the need to make this pump better, I hoped somebody would be willing to get me a good start with some advice. Nobody at my local field plays with pumps that I know of so I have nothing to compare to. My brother did have an ss-25 that I shot a little but that was so long ago I couldn't use that for comparison. I'm guessing there are spring kits that would work with this marker? Is it possible to lighten the spring tension with just some simple adjustments? Thanks for any advice!
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Old 09-20-2008, 08:03 PM   #2 (permalink)
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wow- 17 views so far and no suggestions? Maybe all those view counts were just me checking for posts? I'm probably the only person sitting in front of the computer on a Sat. I didn't get to play today
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Old 09-20-2008, 08:04 PM   #3 (permalink)
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It's difficult, from my knowledge anyway, to actualyl shorten the pump stroke without making it a pneumatic assist. Couple tips for making the stroke lighter would be to; make sure the detent isn't pressing against the bolt (happened on my last sniper), clean and if you can, polish the guide rod(s), check to ensure the pump kit isn't pressing against the barrel - creating friction, and have a look over the gun and try to see if you can find anything gummy or dirty or binding and correct it. If you haven't already ( I assume you bought the gun used) run a squeegy through the top tube and clean your bolt to prevent uneeded friction.
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Old 09-20-2008, 08:44 PM   #4 (permalink)
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The lighter a hammer spring you use, the lighter your pump stroke will be.

The lighter your hammer spring, the lighter your valve spring has to be.

Also, with a lighter hammer spring you need lower pressure.

The lower pressure you have, you need a LP valve from AKA or PPS, etc.

So begins your quest!
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Old 09-20-2008, 08:47 PM   #5 (permalink)
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put an mq valve in for super smooth stroke
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Old 09-20-2008, 08:52 PM   #6 (permalink)
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Well, if you so desire, you can remove the pump return spring altogether. I wouldn't recommend it because you might have the bolt fall open if you are running around with it and don't have your hand on the pump.
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Old 09-20-2008, 09:34 PM   #7 (permalink)
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Start by finding the absolute lightest spring combo. Then adjust, or modify the reg to obtain proper out put pressure.
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mailmanmike Since Monday! That's more than 4 hours though, so according to those cialis ads I should see my doctor.
tlane77 I think for a non-chemical chubby it's 6 hours before its time to see a doctor. So you should be good for another couple hours.
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Old 09-20-2008, 09:53 PM   #8 (permalink)
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Thanks for the help! Where would be the best place to purchase spring kits and valves etc. Will aka valves fit in wgp bodies? I don't want to spend the money on a mq. I don't need to go that far.
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Old 09-21-2008, 01:27 PM   #9 (permalink)
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Most popular retail spring pack kit is the "MadMan".
I find them limited at times though. Best bet is your local ACE sore.
Most valves can be modded for low pressure with files. Just cut of all ecsess material to increase their volume surface area. That means leaving the oring groove area untuched. You can increase the inlet, and out put ports, but then you'll need a cup seal that fits best. That's why you may just want to start with the springs first, rather than the valve.
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THE-SHOOTIST Anyone chubbin' like me for this?
mailmanmike Since Monday! That's more than 4 hours though, so according to those cialis ads I should see my doctor.
tlane77 I think for a non-chemical chubby it's 6 hours before its time to see a doctor. So you should be good for another couple hours.
splattttttt I wasn't goin to google "chubbin" because I assumed it had to do with fat. The lard type, not the fun stuff. But what ever feelings Jeff's experiencing, then they must be of the fun like stuff...
tlane77 He's got a woody for your woods.
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Old 09-23-2008, 05:19 AM   #10 (permalink)
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There is a great deal of information here:

http://www.pumpenstein.com/manuals/C...l_S5BandS6.pdf
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