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semi/full auto bb pistol

Built a BB Machine Gun? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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semi/full auto bb pistol

Unread postAuthor: wyz2285 » Wed Dec 08, 2010 4:58 pm

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.
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Unread postAuthor: more_eggs » Wed Dec 08, 2010 6:00 pm

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
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Unread postAuthor: Vincenzo » Wed Dec 08, 2010 7:13 pm

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.
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: jackssmirkingrevenge » Thu Dec 09, 2010 12:56 am

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 ;)
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Unread postAuthor: wyz2285 » Thu Dec 09, 2010 3:06 am

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
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Unread postAuthor: Vincenzo » Thu Dec 09, 2010 4:58 pm

@JSR I thought the space between the schrader valve and the valve stem was the chamber.
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: wyz2285 » Thu Dec 09, 2010 5:25 pm

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
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Unread postAuthor: wyz2285 » Thu Dec 09, 2010 5:27 pm

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
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Unread postAuthor: Vincenzo » Thu Dec 09, 2010 5:28 pm

That's what I thought. So, the space between the valve stem and the barrel is dead, correct?
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: saefroch » Thu Dec 09, 2010 6:49 pm

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... :?
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Unread postAuthor: Vincenzo » Thu Dec 09, 2010 8:06 pm

Sorry, I was not aware of the detent.
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more_eggs wrote:My teachers hated this one:
Teacher: "Matt, take your iPod out in class"
Me: "beg your pardon sir? I can't hear you, I'm listening to my iPod"
:P
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 10, 2010 1:30 am

Glad we cleared that up :D
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Unread postAuthor: wyz2285 » Fri Dec 10, 2010 3:15 am

But to trust me it's no easy to make that perfect seal detente :roll:
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Unread postAuthor: Mr.Sandman » Fri Dec 10, 2010 11:50 am

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?
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Yeah, it's that important.
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Unread postAuthor: wyz2285 » Fri Dec 10, 2010 2:38 pm

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 :)
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