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PostPosted: Sun Oct 28, 2018 1:39 am 
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Location: Vancouver BC
I mounted the bottle in the same basic way as the original poster but on the wood stock.
Here with some temporary but beefy zap straps. And the bipod weaver mount on the bottom of the bottle, great idea!

Attachment:
qb78hpa4.jpg
qb78hpa4.jpg [ 145.45 KiB | Viewed 444 times ]



Hose clamps work the best but need trimming, I'll get to those next.
I used a piece of of 1/2" acrylic so the bottle clears the stock nut and can go clear back to the trigger guard.
I cut two slots with multiple passes over the table saw and counter sunk four screws.

Attachment:
qb78hpa5.jpg
qb78hpa5.jpg [ 259.43 KiB | Viewed 444 times ]



I'm worried about the hose connection. Not very smooth. Gots some kinks/flats when depressurized. Gets round when pressurized. Not sure how long it's gonna last like this.
Any suggestion for this near 90deg super short connection. I like the bottle where it is.

Attachment:
qb78hpa6.jpg
qb78hpa6.jpg [ 139.37 KiB | Viewed 444 times ]

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PostPosted: Sun Oct 28, 2018 11:30 pm 
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Location: Caronport, Saskatchewan
I'd probably stick a male to male npt connector after your female quick connect then put a female to female hydraulic elbow on the front side going down and another male to male to join it to the on/off Asa. Be worth a try anyway to see if it would fit.

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PostPosted: Sun Oct 28, 2018 11:31 pm 
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Might need a female to male as well to get far enough down.

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PostPosted: Thu Nov 01, 2018 8:39 pm 
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I have the 1500psi paintball regulator and 3000psi bottle from AliedExpress (seller Queensland Paintball) but it runs at 1700psi.
:o
I want more safety headroom so I've been playing with the Bellville springs in the regulator to lower the output pressure.


Despite Bob's 'beginners guide' here I still had to degas and pump from zero a bunch of times.
It's a 0.35liter (big) tank so it's a major workout, eh.

I found other threads too where folks lay out their Bellville spring arrangement with a stated pressure but my results were different when I tried the same arrangement.
So trial and error.

The reg came like this and produced 1700psi
(|)()()()()((

Removed shim = 1450psi
()()()()()((

Arrangement suggested in a thread = 600psi
))()()()()((

Add a shim = 1000psi
|))()()()()((

|)()()()()( = 520psi

Then I went back to the 1450psi arrangement above BUT this time it meters exactly on the 1300psi mark.
Good enough I guess. At least I have some heardroom on the pressure.

I could also read regulator 'creep' after firing 8 dry shots of air in rapid succession. In ordinary single shot shooting the pressure is consistent and point of impact is too.

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PostPosted: Thu Nov 01, 2018 8:51 pm 
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New Olympic shooting sport for those who cant ski...

Pump ur gun from 0-3000psi and then shoot off-hand 12 meters, eh?

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PostPosted: Fri Nov 02, 2018 12:17 pm 
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There’s nothing wrong with running 1300 psi, you should still be able to accomplish almost any tune within reason. Consider that the Umarex Gauntlet ships around 1150 psi, and has way less potential plenum volume to work with.


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PostPosted: Sun Nov 04, 2018 12:23 am 
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How possible is it to use an oil water separator as the pressure cylinder with a paintball regulator?
Seems kinda easy but I haven't seen anyone running their qb78HPA off one.
The appeal for me is a more streamline look and handling over the 2" paintball tank.

The end with the M10 thread would be drilled and tapped for the M18 thread on the PB regulator.
Dumb idea?

Attachment:
High-pressure-Pcp-air-filter-Oil-water-Separator-For-High-Pressure-pcp-compressor-4500psi-30Mpa-300bar.jpg
High-pressure-Pcp-air-filter-Oil-water-Separator-For-High-Pressure-pcp-compressor-4500psi-30Mpa-300bar.jpg [ 154.44 KiB | Viewed 367 times ]

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PostPosted: Sun Nov 04, 2018 12:40 am 
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I wonder if it would make the cap too thin after drilling the input hole so much bigger for the reg. I've thought the same thing, would be fun to use. They are quite heavy for the little bit of air that they hold though. I think a 13ci tank might be more practical though I do like the looks better I agree with this filter.

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PostPosted: Sun Nov 04, 2018 12:45 am 
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Well, the shot count is way down from how many I was getting with 1700psi.
At 1700psi I got 200 shots at 500fps
At 1300psi I got 90 shots. But it shooting harder than 500fps and probably wasting air. I need to pull a shim out of the hammer spring. Hopefully the shot count will go back up cuz I'm doing a lot more hand pumping.
This is from a full 3000psi fill down to 2000psi with a large 0.35L bottle. Takes 6min of pumping.

987654321 wrote:
There’s nothing wrong with running 1300 psi, you should still be able to accomplish almost any tune within reason. Consider that the Umarex Gauntlet ships around 1150 psi, and has way less potential plenum volume to work with.

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PostPosted: Sun Nov 04, 2018 12:54 am 
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wesb2007 wrote:
I wonder if it would make the cap too thin after drilling the input hole so much bigger for the reg. I've thought the same thing, would be fun to use. They are quite heavy for the little bit of air that they hold though. I think a 13ci tank might be more practical though I do like the looks better I agree with this filter.

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Here is the picture that set my imagination off in this direction to adapt a hatsan cylinder.
. To bad the link is in another language.
https://perdigoncabezon.es.tl/Pasar-Gam ... -a-pcp.htm
Attachment:
2ag3uph.jpg
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PostPosted: Sun Nov 04, 2018 1:45 am 
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It sure would be nice if the PB regulator just fit and screwed into the filter :D

Have you tried that with a metric thread regulato?

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PostPosted: Sun Nov 04, 2018 7:58 am 
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Pushtone wrote:
Well, the shot count is way down from how many I was getting with 1700psi.
At 1700psi I got 200 shots at 500fps
At 1300psi I got 90 shots. But it shooting harder than 500fps and probably wasting air. I need to pull a shim out of the hammer spring. Hopefully the shot count will go back up cuz I'm doing a lot more hand pumping.
This is from a full 3000psi fill down to 2000psi with a large 0.35L bottle. Takes 6min of pumping.

987654321 wrote:
There’s nothing wrong with running 1300 psi, you should still be able to accomplish almost any tune within reason. Consider that the Umarex Gauntlet ships around 1150 psi, and has way less potential plenum volume to work with.
Interesting what velocity it's at now. Taking that shim out should help a lot, and you should save yourself some work and only pump to 2500psi and see how many shots you get before falling off the reg. =)

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PostPosted: Mon Nov 26, 2018 3:07 pm 
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MY acrylic plastic stock adapter was tight and secure but made a creeking sound when handled. I made another one out of Teflon plastic and this time I concaved the top and bottom to better fit the bottom of the rifle stock and the bottle. Now very secure but no creeking sound. Used a table saw to cut a stair stepped groove then sanded with 80grit wrapped around a small tomato paste can.

But what this rifle really needs is a quick release system for the bottle. :idea:

Old adapter
Attachment:
qb78hpa5.jpg
qb78hpa5.jpg [ 259.43 KiB | Viewed 262 times ]



New adapter
Attachment:
IMG_20181118_183411.jpg
IMG_20181118_183411.jpg [ 87.58 KiB | Viewed 262 times ]



Old and new
Attachment:
IMG_1139.jpg
IMG_1139.jpg [ 327.05 KiB | Viewed 262 times ]

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