Page 1 of 1

QEV blowback mod?

Posted: Mon May 11, 2020 10:43 pm
by Airgunloverboy265
Hey guy's me again Ive tried a few design's and idea's for my homemade blowback uzi but they didn't work so well. So I decided to use a qev this one to be exact https://encrypted-tbn3.gstatic.com/shop ... I&usqp=CAE anyways my question is, does anyone know if there's a mod that would make the qev have a blowback action maybe at the end of it?

Re: QEV blowback mod?

Posted: Thu May 14, 2020 4:31 am
by jackssmirkingrevenge
What exactly do you mean by "blowback action"? Do you want the QEV to also operate a self-loading mechanism?

Re: QEV blowback mod?

Posted: Thu May 14, 2020 12:53 pm
by Airgunloverboy265
jackssmirkingrevenge wrote:
Thu May 14, 2020 4:31 am
What exactly do you mean by "blowback action"? Do you want the QEV to also operate a self-loading mechanism?
What I mean is I want it to kinda operate like Wen's for example as you see at the end of his Qev he has a tube with a plunger and spring and if you watch closely it goes back and forth as he pulls the blowgun trigger and air still comes out of the Qev's front end.

Re: QEV blowback mod?

Posted: Sat May 16, 2020 4:06 am
by jackssmirkingrevenge
That is the pop-off valve that actuates the QEV.

I had done something similar with a commercial pop-off valve:



The movement of the pop-off pistol is brief and abrupt, I do not think you could get it to operate a blowback mechanism.

It would make more sense to harness the exhaust air from the pop-off pilot to do reloading work.

Re: QEV blowback mod?

Posted: Sat May 16, 2020 1:42 pm
by keks2033
Airgunloverboy265 wrote:
Mon May 11, 2020 10:43 pm
Hey guy's me again Ive tried a few design's and idea's for my homemade blowback uzi but they didn't work so well. So I decided to use a qev this one to be exact https://encrypted-tbn3.gstatic.com/shop ... I&usqp=CAE anyways my question is, does anyone know if there's a mod that would make the qev have a blowback action maybe at the end of it?
it is much better to make the drummer cock up with air that leaves the pilot valve.


Re: QEV blowback mod?

Posted: Tue May 19, 2020 7:03 am
by jackssmirkingrevenge
keks2033 wrote:
Sat May 16, 2020 1:42 pm
it is much better to make the drummer cock up with air that leaves the pilot valve.
That works too and is especially useful if one were making a big-bore repeater where too much air would be wasted cocking a direct hammer valve.

I have animated it to explain the concept:

Image

Re: QEV blowback mod?

Posted: Tue May 19, 2020 5:29 pm
by Airgunloverboy265
jackssmirkingrevenge wrote:
Tue May 19, 2020 7:03 am
keks2033 wrote:
Sat May 16, 2020 1:42 pm
it is much better to make the drummer cock up with air that leaves the pilot valve.
That works too and is especially useful if one were making a big-bore repeater where too much air would be wasted cocking a direct hammer valve.

I have animated it to explain the concept:

Image
Hmmmmmmmm I think i'll give this design a try, I might be able to use a bullpup design to make room for the magazine. Also would it still operate as the diagram if I were to scale it down a little to fit inside the back of the micro uzi design?

Re: QEV blowback mod?

Posted: Sat May 30, 2020 4:20 am
by jackssmirkingrevenge
On a small scale it's not worth having a piloted exhaust valve, the hammer can open your main valve directly:

Image