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Old 12-06-2011, 09:08 PM #1
bracer028
 
 
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Drilling the pump guide

Does anyone do this service? I want to expand the air chamber by making more space in the pump guide.

does anyone do this?
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Old 12-06-2011, 09:15 PM #2
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It's not that hard to do yourself with a drill, but anyone with a drill press should be able to do it
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Old 12-06-2011, 11:48 PM #3
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Quote:
Originally Posted by drgonzo View Post
It's not that hard to do yourself with a drill, but anyone with a drill press should be able to do it
Doable, but since it is going to be under pressure, I would leave it to a professional to ensure the walls are uniform and not too thin.

JCurt would probably do the work and he will give you the best price.
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Old 12-07-2011, 12:10 AM #4
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Originally Posted by drgonzo View Post
It's not that hard to do yourself with a drill, but anyone with a drill press should be able to do it
Yep, and if the guide is already drilled out and all you're doing is enlarging it a little bit, you don't even really need a drill press.
Just take your time and use each bit sequentially to avoid going out of alignment.

I did this on my WWA ultra mini kit as well as enlarging the valvechamber of my Superbolt.
I ended up being able to drop the working pressure by at least 50psi, but I think most of it was the passage in the body more than the guide rod.
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Old 12-07-2011, 04:19 AM #5
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I remember offering to do this for you once...
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Old 12-07-2011, 02:12 PM #6
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I remember offering to do this for you once...
yea...but i didn't want to trouble you too much. Since you helped me with my gun so many times.
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Old 12-07-2011, 03:20 PM #7
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I'll have to take pictures of my little brother's orry on the inside. I drilled it out using a drill press. I could do the same for you.
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Old 01-09-2012, 07:39 PM #8
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I'll have to take pictures of my little brother's orry on the inside. I drilled it out using a drill press. I could do the same for you.
Load pictures I will like to see if I can do the same.....
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Old 01-13-2012, 01:22 PM #9
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Quote:
Originally Posted by Ironboy360 View Post
Load pictures I will like to see if I can do the same.....
I followed the instructions in this thread:

http://www.pbnation.com/showthread.php?t=2689852
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Old 01-14-2012, 02:15 AM #10
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We got it taken care of last month.
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Old 01-14-2012, 01:47 PM #11
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I followed the instructions in this thread:

http://www.pbnation.com/showthread.php?t=2689852
Very good inst. thanks.....
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Old 01-23-2012, 06:13 PM #12
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did this on my S6 main guide rod. since they come solid. gained so much volume. that and a medium sidewinder. run my gun at like 210psi. very quiet. looking for a new belt for my little tabletop lathe and i could do it for you easily.
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Old 01-23-2012, 06:14 PM #13
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Maybe I should have mentioned I already drilled this for him last month...

Though he hasn't tested it yet..?
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Old 01-23-2012, 10:13 PM #14
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Maybe I should have mentioned I already drilled this for him last month...

Though he hasn't tested it yet..?
cmon castro...

I just haven't touched my PB gear in a long long time. I don't have access to a chrono and air so I just left it there.
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Old 01-24-2012, 02:18 AM #15
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Right, but it seems like everyone offering help at this point isn't reading anything, and I'd rather not simply close this.
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Old 01-29-2012, 05:36 PM #16
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I finally tested the pump guide drilling.

over the chrono, before the drilling, i was shooting about 245-250.

afterwards, I'm shooting at 255-260.

so there is about a 15 fps increase. not too shabby for just simply increasing the pump guide.
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Old 01-29-2012, 08:31 PM #17
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I'm not sure how much larger it can go safely, but if you're interested, give me a shout.
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Old 01-30-2012, 06:44 PM #18
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I'm not sure how much larger it can go safely, but if you're interested, give me a shout.
Ya me either. I think at this point, its pretty safe with good results.

Thanks again.
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