[bracer028]

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

does anyone do this?

[drgonzo]

It's not that hard to do yourself with a drill, but anyone with a drill press should be able to do it

[wowzerz]

Originally Posted by drgonzo

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.

[The Inflicted]

Originally Posted by drgonzo

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.

[Castro #66]

I remember offering to do this for you once...

[bracer028]

Originally Posted by Castro #66

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.

[Zepulkinator]

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.

[Ironboy360]

Originally Posted by Zepulkinator

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.....

[Zepulkinator]

Originally Posted by Ironboy360

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

[Castro #66]

We got it taken care of last month.

[Ironboy360]

Originally Posted by Zepulkinator

I followed the instructions in this thread:

http://www.pbnation.com/showthread.php?t=2689852

Very good inst. thanks.....

[LiLJoHn843]

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.

[Castro #66]

Maybe I should have mentioned I already drilled this for him last month...

Though he hasn't tested it yet..?

[bracer028]

Originally Posted by Castro #66

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.

[Castro #66]

Right, but it seems like everyone offering help at this point isn't reading anything, and I'd rather not simply close this.

[bracer028]

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.

[Castro #66]

I'm not sure how much larger it can go safely, but if you're interested, give me a shout.

[bracer028]

Originally Posted by Castro #66

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.