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PostPosted: Tue Aug 04, 2015 10:49 am 
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Location: 1/2 Way From Ottawa and Montreal,
So I would need to know if the QB78 and the Benjamin discovery have the same tube size or close to the same.
could we mod a Discovery Valve to fit in a QB78 and so on?

all comments welcome.

I just Had a idea for a mod and I don't want to have to empty and take my 2 rifles apart to measure them, but if you guys don't know
I will.

Yes I did use the Search button.

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PostPosted: Tue Aug 04, 2015 11:01 am 
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Location: Brant County
disco 0.747
qb 78 0.748

thats from google but im not 100% so dont quote me on that but im sure a pro will chime in to help ya out Frank ;)

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PostPosted: Tue Aug 04, 2015 11:43 am 
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Are you serious? so in other words that like the same?
so I could put one valve in the other and so on?

0.001 is like nothing, so I could install a disco valve in a QB78?

Thanks for your help H2P, you just made my day.

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PostPosted: Tue Aug 04, 2015 4:04 pm 
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So Anyone one else want to chime in to confirm this.

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PostPosted: Tue Aug 04, 2015 4:07 pm 
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Location: Vancouver
As far as I know the heavily modified QB78 I acquired recently has a Disco valve in it. I wasn't ably to get a reply from the guy who did the build, but did find the gun on an old thread on the Network54 forum so I'm fairly certain of the specifications. Haven't had the thing apart though, and I don't have a Discovery, so can't confirm absolutely.


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PostPosted: Tue Aug 04, 2015 4:17 pm 
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i had a 2240 with a qb valve in it, just sayin....
the guy that helped me out had a disco front half of the valve (at least) stuffed into a 2240... i look dumbed but i knowed a bit ;) lol i had a 2240 with a qb valve and a qb79 tankblock and have pics to prove cuz without pics it didnt happen right? ;)

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Last edited by Hacked2Pieces on Tue Aug 04, 2015 4:22 pm, edited 1 time in total.

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PostPosted: Tue Aug 04, 2015 4:19 pm 
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The Disco tube is, in theory, 0.745" ID, but the valve and gauge port are undersize, about 0.738" and will fit in a QB tube no problem.... Sometimes if you get an oversize QB valve it will not fit in a Disco tube, however....

Bob

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PostPosted: Tue Aug 04, 2015 4:58 pm 
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Thanks guys really Thanks.

so I can install a Benjamin Discovery Regulator in a QB78.
I will keep you posted about this one.

so fun to have spare time if only I had Cash lol.

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PostPosted: Sun Aug 09, 2015 2:34 am 
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rsterne wrote:
The Disco tube is, in theory, 0.745" ID, but the valve and gauge port are undersize, about 0.738" and will fit in a QB tube no problem.... Sometimes if you get an oversize QB valve it will not fit in a Disco tube, however....

Bob


And sometimes that replacement part QB/AR valve is too large for a custom QB/AR tube.
I recall having to turn one down slightly a while back... took all of 3 minutes, spun in the d.p. against 600 and 1000 wt. autobody paper :lol:

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Doc Sharptail

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PostPosted: Sun Aug 09, 2015 11:14 am 
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Yes, Custom QB tubes are generally made from the same (inch) dimension tubing as the 22XX and Disco, instead of the original Metric....

Bob

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Proud Member of the 2000+fps Club!


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PostPosted: Sun Aug 09, 2015 1:41 pm 
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Location: Alberta Canada
One thing to also consider is oring compression.
Material and durometer pending a good seal requires atleast (min)0.004 compression upon the oring for an optium seal. Harder materials like Urathane require at least 0.006 - 0.008. Shapes also play a part as to being an "O" ring, a Quad, or a Square.
I only use Quad rings upon my builds. After having a 113 Nitrile quad ring hold up after a decade of a liquid Co2 charge. Just proves its existance and usage. But then this is just my experience and opinion.

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