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Gavin7
 Post subject: QB78 PCP tube
PostPosted: Thu Dec 24, 2020 9:52 pm 
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Joined: Thu Dec 17, 2020 7:49 am
Posts: 13
Location: Ontario
All right so I know this has been brought up before but I am looking for a source for a pcp tube Roy mountain air guns doesn't ship to Canada as far as I know and a bunch of the other sources don't seem to sell them any more.

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Crossman 1077 12 shot repeater in .177
Beeman Model 1085 bolt action in .22 cal

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Castle02
 Post subject: Re: QB78 PCP tube
PostPosted: Thu Dec 24, 2020 10:18 pm 
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Joined: Fri Dec 30, 2005 2:14 am
Posts: 1902
Location: Calgary, Alberta
I had mine done by a member here, but I don't recall who it was. The tube holds 2000 psi. Pretty nice shooter.

Rich

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Gippeto
 Post subject: Re: QB78 PCP tube
PostPosted: Fri Dec 25, 2020 1:42 am 
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Joined: Tue Jun 03, 2008 5:46 pm
Posts: 3009
Location: Canada
Would suggest you contact DerekVinyard here on the forum. If you strike out there, shoot me a pm and we can talk about it.

topic76363.html?hilit=qb%20tubes

Al
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Gavin7
 Post subject: Re: QB78 PCP tube
PostPosted: Fri Dec 25, 2020 7:11 am 
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Joined: Thu Dec 17, 2020 7:49 am
Posts: 13
Location: Ontario
All right I'll try that when I looked at his profile it looks like he has not been active since 2018?

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Guns I currently have
Crossman 1077 12 shot repeater in .177
Beeman Model 1085 bolt action in .22 cal

Guns I like
Qb78 and Qb79
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Gavin7
 Post subject: Re: QB78 PCP tube
PostPosted: Fri Dec 25, 2020 7:32 am 
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Joined: Thu Dec 17, 2020 7:49 am
Posts: 13
Location: Ontario
Scratch that just seen he was on a few days ago, I sent him a pm.

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Guns I currently have
Crossman 1077 12 shot repeater in .177
Beeman Model 1085 bolt action in .22 cal

Guns I like
Qb78 and Qb79
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Gavin7
 Post subject: Re: QB78 PCP tube
PostPosted: Sun Jan 17, 2021 8:07 pm 
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Joined: Thu Dec 17, 2020 7:49 am
Posts: 13
Location: Ontario
Pm him he is not currently up to that anyone else or any other options

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Guns I currently have
Crossman 1077 12 shot repeater in .177
Beeman Model 1085 bolt action in .22 cal

Guns I like
Qb78 and Qb79
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remtom1200
 Post subject: Re: QB78 PCP tube
PostPosted: Sat Feb 13, 2021 12:21 pm 
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Joined: Sat Feb 14, 2015 11:34 pm
Posts: 10
Bought mine years ago from scopes and ammo. It come from a BC machinist if I can recall.

Sent from my SM-N986W using Tapatalk
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Woody
 Post subject: Re: QB78 PCP tube
PostPosted: Sat Feb 13, 2021 1:51 pm 
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Joined: Thu Sep 01, 2005 1:41 pm
Posts: 1029
Location: GTA
I've been wanting one for years. I gave up trying after a few failed attempts.

Now I'm just planning to get a Beeman QB Chief, probably easiest way these days. But I can't find one in stock in Canada. Any leads? Even used would be great, as long as it is stock and not Bubba'd.
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remtom1200
 Post subject: Re: QB78 PCP tube
PostPosted: Sat Feb 13, 2021 2:14 pm 
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Joined: Sat Feb 14, 2015 11:34 pm
Posts: 10
You need 4130 chromoly tube, but the thickness I'd have to find an old piece to measure thickness. Find a machinest to mill and drill it, including proper retaining screws and dimensions for shear strength x3. I paid 298+ tax n shipping for my tube way back.

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Normk
 Post subject: Re: QB78 PCP tube
PostPosted: Tue Mar 02, 2021 3:15 pm 
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Joined: Sat Jul 11, 2020 5:36 pm
Posts: 819
Location: Chilliwack, BC
I'm interested in this since I have a QB79 which is converted to use a 13ci/3000 PSI Ninja bottle.

Reading online reveals contradictory opinions regarding the safe pressures, especially that of requiring additional screws and of the advisability of removing trigger screws with the bottle in place.


If anyone has further information, I'm likely not to be the only appreciative ear.

Here's one link: http://www.canadianairguns.com/showthre ... L-Required)&fbclid=IwAR0BjLP2aYx0IWZa4j7V-UxbOH9eBm09duCVhTg3i6pdJQxlMbFrF1hUguM

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Gippeto
 Post subject: Re: QB78 PCP tube
PostPosted: Tue Mar 02, 2021 3:44 pm 
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Joined: Tue Jun 03, 2008 5:46 pm
Posts: 3009
Location: Canada
You're a little vague as far as stating what exactly it is that you're interested in. If you have specific questions, best to just ask outright.

A "good" tubing to use is.. JMO...7/8" od x .065" seamless 4130. Pinned in what I would consider a "proper" manor, it will have a minimum 3x safety factor at MWP of 3000psi.

Some reading on pinning; Keep screw holes a minimum of 1.5x the hole diameter from from the tube edge. Measured from the hole center to the tube edge...I prefer and use 2x.

viewtopic.php?forum_uri=&t=69553&start=

Al
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