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 Post subject: Re: custom QB78D carbine
PostPosted: Mon Oct 17, 2016 1:29 pm 
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Joined: Mon Jan 18, 2016 6:54 pm
Posts: 3
Looks like scopes and ammo has it

Sent from my SM-N910W8 using Tapatalk


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 Post subject: Re: custom QB78D carbine
PostPosted: Wed Oct 19, 2016 4:52 pm 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
WispStalkCaps wrote:
Looks like scopes and ammo has it

Sent from my SM-N910W8 using Tapatalk


Yup :)


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 Post subject: Re: custom QB78D carbine
PostPosted: Wed Oct 19, 2016 4:57 pm 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
Hacked2Pieces wrote:
Envious :evil: I want that parts gun back AND with the updated mods ;) very nice work my good man very nice indeed!!!


NO WAY! I'm keeping it :lol:

Thanks for the good words, Hacked :wink: :D .


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 Post subject: Re: custom QB78D carbine
PostPosted: Thu Oct 20, 2016 5:24 am 
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Joined: Fri Jul 01, 2016 7:47 am
Posts: 711
Location: Bradford
On the repeater kit...will it function with round nose, or is it limited to wadcutters? I haven't given Eric any money in almost a week and am suffering withdrawal :)

Thank you

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When the 425-hp "street Hemi" version hit the street in 1965, it was akin to taking an M230 chain gun to an arcade shooting gallery
Peter


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 Post subject: Re: custom QB78D carbine
PostPosted: Thu Oct 20, 2016 3:37 pm 
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Joined: Tue Oct 13, 2009 1:27 am
Posts: 2514
Location: Vancouver
I'm curious about this auto-feeding magazine as well. I have one of these older types, just a hand-turned model, and find that unless I tilt the rifle (QB78D) to one side by about 20° my pellets (always JSB, usually 18.13gr) tip forward and get smashed sideways when closing the bolt. Does this Czech magazine somehow eliminate this problem?

http://www.airgunartisans.com/AAQBMags.htm

Even if it didn't, I'm still interested, as auto-indexing would be a nice feature and I could always continue tilting while cocking.


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 Post subject: Re: custom QB78D carbine
PostPosted: Thu Oct 20, 2016 5:56 pm 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
ITGUY wrote:
On the repeater kit...will it function with round nose, or is it limited to wadcutters? I haven't given Eric any money in almost a week and am suffering withdrawal :)

Thank you


I only tried CPHP (0.263'' in length) and Crosman pointed (0.282'' in length), and they fit very well. I'm convinced that domed pellets or wadcutters would cycle very well too. The minimum measurement I took of the inside length of the magazine is 0.335'', so there's some room left for longer pellets. There are some adjustments to make, but it's well explained in the installation PDF. Suffer no more and enjoy :) .


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0.335''.JPG
0.335''.JPG [ 177.78 KiB | Viewed 587 times ]
hollow_point.JPG
hollow_point.JPG [ 126.05 KiB | Viewed 587 times ]
pointed.JPG
pointed.JPG [ 134.54 KiB | Viewed 587 times ]
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 Post subject: Re: custom QB78D carbine
PostPosted: Thu Oct 20, 2016 6:29 pm 
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Joined: Thu May 07, 2015 8:30 pm
Posts: 1190
Location: Eastern Townships
GerardSamija wrote:
I'm curious about this auto-feeding magazine as well. I have one of these older types, just a hand-turned model, and find that unless I tilt the rifle (QB78D) to one side by about 20° my pellets (always JSB, usually 18.13gr) tip forward and get smashed sideways when closing the bolt. Does this Czech magazine somehow eliminate this problem?

http://www.airgunartisans.com/AAQBMags.htm

Even if it didn't, I'm still interested, as auto-indexing would be a nice feature and I could always continue tilting while cocking.


No need to tilt the rifle with this repeater kit, Gerard. The cycling is smooth and precise, there's no binding or jamming with the pellets I tried. In fact, you don't actually feel any more efforts when using the magazine, and the pellets fall exactly at the right place, well indexed. You can also remove the magazine and shoot single shots without the need for a tray. I find there's only one small flaw with this system, it's the fragile actuating lever protruding out when the bolt is cocked. With a cock-on-close bolt, you can just leave the bolt cocked when storing the rifle and the lever will stay in the loading area.

The finish is a bit rough but easily improved. Some de-burring, polishing and moly application did help the cycling significantly. I'd say it's the same kind of tuning you would do on a 13xx/22xx trigger group for example. I also added a small nylon washer between the lever and its spring, which helped to remove some lateral play. Other than that, once adjusted correctly (5-10 min. tinkering), it functions the way you expect it to, very well!


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actuating_lever.JPG
actuating_lever.JPG [ 145.18 KiB | Viewed 586 times ]
lever_inside.JPG
lever_inside.JPG [ 117.63 KiB | Viewed 586 times ]
washer.JPG
washer.JPG [ 131.24 KiB | Viewed 586 times ]
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 Post subject: Re: custom QB78D carbine
PostPosted: Thu Oct 20, 2016 7:13 pm 
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Joined: Tue Oct 13, 2009 1:27 am
Posts: 2514
Location: Vancouver
Thanks for the report. If I do get one it seems likely I'd be making a new lever out of of 01 tool steel or similar, something a bit beefier as I'd not want to rely on something quite that fragile. And I don't leave my rifle bolts in closed position, as it tends to prematurely compress the seals.


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