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.50" QEV gun *New stock, almost finished*

Posted: Fri Jul 23, 2010 9:44 am
by zy
Just dropping by to inspire fellow spudders with this newly built QEV gun.
Hope you will enjoy it.

Info

1/2" QEV.
Pilot valve: modified blowgun (original didn`t take pressure over ~10 bar, and too low airflow).
.50" barrel, 57cm long (22 inch).
Wooden stock with adjustable length.
Scope is a cheap 3~9X40 GD from Dealextreme.
Pump: fork-pump that can handle 450psi/31bar.
Operating pressure: I actually dont know myself because the manometer on the fork-pump is somewhat... bad. When my compressor shows 9 bar, this show about 5 bar :? . But I take it too ~10 bar, so maybe 15 bar`ich?
It is probably calibrated to show accurate measurements @ 30 bar.


The gun is easily taken apart without tools for transportation etc.

Next project will be a semi-auto bullpup design with a 1/2" T-valve actuated by a electromagnet (coil + magnetic piston). But it will probably take a while to build, if I ever complete it... Well, that is another story.



Peace :)

Posted: Fri Jul 23, 2010 9:48 am
by jackssmirkingrevenge
Very nicely put together, in a quaint sort of way :) must take a bit of effort to get it up to pressure though as the chamber seems relatively large, you would have been better off with a smaller chamber and higher pressure.

The stock is particularly well finished, what wood is it?

Posted: Fri Jul 23, 2010 9:48 am
by Lockednloaded
that stock is amazing, but the gun looks kind of dangly next to it. I recommend a wooden support

Posted: Fri Jul 23, 2010 9:51 am
by jackssmirkingrevenge
You might want to try sleeving the barrel as suggested here, it would look less skinny plus you'd have the benefit of an integral silencer ;)

Posted: Fri Jul 23, 2010 9:52 am
by zy
jackssmirkingrevenge wrote:Very nicely put together, in a quaint sort of way :) must take a bit of effort to get it up to pressure though as the chamber seems relatively large, you would have been better off with a smaller chamber and higher pressure.

The stock is particularly well finished, what wood is it?

Aaa forget, the chamber is about 110cc. Yeah it take 200 pumps to ~15 bar (bad manometer...). The problem is that I am a coward, the QEV`s max pressure is 12 bar, and I have no idea how much punishment it can take... So I am on the safe side ;).

Posted: Fri Jul 23, 2010 9:53 am
by zy
Lockednloaded wrote:that stock is amazing, but the gun looks kind of dangly next to it. I recommend a wooden support
It is actually very stable :)

Posted: Fri Jul 23, 2010 9:56 am
by zy
jackssmirkingrevenge wrote:You might want to try sleeving the barrel as suggested here, it would look less skinny plus you'd have the benefit of an integral silencer ;)
Hehe yeah, maybe I do, someday. But Im satisfied with the looks, or, I dont care so much for the looks. as long as it works, Im fine hehe.

Posted: Fri Jul 23, 2010 10:04 am
by spudtyrrant
zy wrote: The problem is that I am a coward, the QEV`s max pressure is 12 bar, and I have no idea how much punishment it can take... So I am on the safe side ;).
i personally have taken them to 30 bar, some people on this forum have taken them as far as 60 bar, multiple times without failure :wink:

Posted: Fri Jul 23, 2010 10:14 am
by c11man
ive been to 45, who takes theres to 60?

Posted: Fri Jul 23, 2010 10:14 am
by zy
spudtyrrant wrote:
zy wrote: The problem is that I am a coward, the QEV`s max pressure is 12 bar, and I have no idea how much punishment it can take... So I am on the safe side ;).
i personally have taken them to 30 bar, some people on this forum have taken them as far as 60 bar, multiple times without failure :wink:
Oh... thats... sick.... :shock: . Well, maybe 20 bar wouldnt be so bad?

Posted: Fri Jul 23, 2010 10:16 am
by zy
jackssmirkingrevenge wrote:You might want to try sleeving the barrel as suggested here, it would look less skinny plus you'd have the benefit of an integral silencer ;)
God dammit now Im sleeving it :P... Had some pvc-pipe laying around, but Im out of paint so it will look shitty until I get some new paint.

Posted: Fri Jul 23, 2010 1:35 pm
by spudtyrrant
c11man wrote:ive been to 45, who takes theres to 60?
jeepkahn in the decimator, and maggotman(not the best example lol)

Posted: Fri Jul 23, 2010 5:43 pm
by jackssmirkingrevenge
zy wrote:Gosh darnit now Im sleeving it :P
If you're going to increase the pressure, you'll need the extra suppression ;)

Posted: Fri Jul 23, 2010 5:48 pm
by jakethebeast
hey that looks cool


this is offtopic but i just dont want to make a new topic out of this: if i had a barrel sealing piston valve with spring behind the piston, would it be semi-automatic if i pilot it with small qev? if so, do the small qev need to have a spring?

Posted: Fri Jul 23, 2010 5:50 pm
by jackssmirkingrevenge
jakethebeast wrote:if i had a barrel sealing piston valve with spring behind the piston, would it be semi-automatic if i pilot it with small qev?
yes
if so, do the small qev need to have a spring?
no