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semi/full auto bb pistol

Posted: Wed Dec 08, 2010 4:58 pm
by wyz2285
Thanks to JSR's valve less design, I built this semi/full auto pistol. Really like it makes me remember the magnum:D and looks like the first semi/full auto pistol around here :o .The barrel has a suppressor and a 1/4 male connection to a additional silencer, the gun is a mod blowgun, now it has much more space for chamber :) Haven't get a shock pump yet, so only tested at 100 psi, for 2 semi shots :oops:
Don't have a video right now and I'm not sure if I will make one :roll: because a lot of people will ask me how it works and a how to video.

Posted: Wed Dec 08, 2010 6:00 pm
by more_eggs
Lookin good dude... Is it barrel loaded?
I'm guessing u drilled out and sealed the handle to make a bigger chamber space?
Would make a nice little portable few shot gun..
Good stuff

Posted: Wed Dec 08, 2010 7:13 pm
by Vincenzo
The thing I don't like is the dead space betweem the valve stem and the actual barrel. Also, what size is the barrel? It looks like a regular pipe nipple.

Posted: Thu Dec 09, 2010 12:56 am
by jackssmirkingrevenge
Very nice! Needs higher pressure for moar powah/shots per fill, or you could connect it to a paintball tank via remote line
Vincenzo wrote:The thing I don't like is the dead space between the valve stem and the actual barrel.
In this case, it's not dead space because in the valveless/pop-off principle that space between feed valve and breech is actually the effective chamber volume ;)

Posted: Thu Dec 09, 2010 3:06 am
by wyz2285
more_eggs wrote:Lookin good dude... Is it barrel loaded?
I'm guessing u drilled out and sealed the handle to make a bigger chamber space?
Yes :) you are correct

Posted: Thu Dec 09, 2010 4:58 pm
by Vincenzo
@JSR I thought the space between the schrader valve and the valve stem was the chamber.

Posted: Thu Dec 09, 2010 5:25 pm
by wyz2285
Vincenzo wrote:@JSR I thought the space between the schrader valve and the valve stem was the chamber.
And it's the chamber :D ask JSR for details

Posted: Thu Dec 09, 2010 5:27 pm
by wyz2285
Vincenzo wrote:@JSR I thought the space between the schrader valve and the valve stem was the chamber.
And it's the chamber :D ask JSR for details

Posted: Thu Dec 09, 2010 5:28 pm
by Vincenzo
That's what I thought. So, the space between the valve stem and the barrel is dead, correct?

Posted: Thu Dec 09, 2010 6:49 pm
by saefroch
No, it's not dead space. Dead space is the volume between the main valve and the initial projectile position. In this design, there is no main valve, the projectile acts like the valve. Therefore, zero dead space. The space that you're calling dead is the volume that depressurizes to force the projectile down the barrel (effective chamber volume).

This may just be a semantics confusion... :?

Posted: Thu Dec 09, 2010 8:06 pm
by Vincenzo
Sorry, I was not aware of the detent.

Posted: Fri Dec 10, 2010 1:30 am
by jackssmirkingrevenge
Glad we cleared that up :D

Posted: Fri Dec 10, 2010 3:15 am
by wyz2285
But to trust me it's no easy to make that perfect seal detente :roll:

Posted: Fri Dec 10, 2010 11:50 am
by Mr.Sandman
Ah, very nice, simple and clean. I really do like the simplicity of this particular build. It really is a shame that you don't have a shock pump yet, I'm interested as to how loud it is.
wyz2285 wrote:Don't have a video right now and I'm not sure if I will make one :roll: because a lot of people will ask me how it works and a how to video.
I am assuming you mean on youtube?

Posted: Fri Dec 10, 2010 2:38 pm
by wyz2285
Mr.Sandman wrote: It really is a shame that you don't have a shock pump yet, I'm interested as to how loud it is.

I am assuming you mean on youtube?
Well I bought it today :P cost me 36 euros :x !!!!!!yes I meant youtube :)