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auto-piston prototype

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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Unread postAuthor: MrCrowley » Sun Jan 20, 2008 7:24 pm

jackssmirkingrevenge wrote:
MrCrowley wrote:JSR made something work! :shock:

Praise the lord :D


Oh COME ON, I've made lots of things work! I've only had a string of failures lately because I took on something a bit more complex, if I had stuck to making ordinary piston cannons like you lot I'd have had success after success :D but seriously, after this, I need to make me a nice single shot launcher, I was thinking of a suppressed 3/4" piston design, sawn-off style (yes, I really liked that movie!)


Haha yeah just pulling your leg. :wink: (Yes i'm fully aware you are going to rip that apart and spit out something completely different)

'bout time, not because I don't like full auto, but because you are so good with full auto mechanisms, I can't wait to see what you can do with a single shot :P
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Unread postAuthor: POLAND_SPUD » Sun Jan 20, 2008 7:41 pm

...it is alive !! :twisted:

(kudos JSR)
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 20, 2008 7:57 pm

Let's wait till we actually see it shoot something :)

MrCrowley wrote:Haha yeah just pulling your leg. :wink: (Yes i'm fully aware you are going to rip that apart and spit out something completely different)


I'm so happy this thing is finally working I can't be bothered, just make sure it's not my third leg you're tugging at :D
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Unread postAuthor: Hotwired » Sun Jan 20, 2008 8:14 pm

I'm amused that it got camera shy :wink:

Teach it to get over that stage fright and bring it out again for its big stage debut :)


jackssmirkingrevenge wrote:
MrCrowley wrote:Haha yeah just pulling your leg. :wink:

just make sure it's not my third leg you're tugging at :D

Dam right, Jack was just saying how much epoxy it takes to glue one of those on.
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Unread postAuthor: Skywalker » Sun Jan 20, 2008 9:18 pm

Good going Jack! 8) Glad to see that working for you. Can't wait to see what it does w/ a barrel + ammo!

PS: Oh no, doggonit Hotwired, not that again! lol I guess Jack's the one that started it this time, though... *shakes head*
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Unread postAuthor: clide » Sun Jan 20, 2008 9:22 pm

Congrats on getting it working, and I'm glad you finally got a camera with sound.
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<a href="http://gbcannon.com" target="_blank"><img src="http://gbcannon.com/pics/misc/pixel.png" border="0"></a>latest update - debut of the cardapult

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Unread postAuthor: thespeedycicada » Sun Jan 20, 2008 10:16 pm

That sound made me smile :)
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current projects: co-axial piston valve.Status DONE!
S.P.E.C.S update mk 1 construction begining in febuary all the maths for it are done plans are drawn up and parts are listed.
NEXT project:auto piston valve.
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Unread postAuthor: c19o » Mon Jan 21, 2008 12:13 am

JSR, maybe making a small, say .25" porting piston valve piloted with a Snapvalve.
One of my .5" porting valves sounds like a machinegun when I pilot with my thumb over the .25" nipple and pulsing it.
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 21, 2008 1:38 am

clide wrote:Congrats on getting it working, and I'm glad you finally got a camera with sound.


cheers :) audio is courtesy of my new cellphone :D - it records videos as .3gp, problem is when I convert them to .avi they're huge (from less than one mb to about 20 megs) and if I upload them to you tube, it flips them upside down and they're laterally inverted :?

Yes, hmmm, indeed, congratulations. I've been roaming these forums for a while now and concluded that this website has too much information about homemade weaponry. As its too easy for the average joe to make something
very destructive and life threatening. I have contacted many federal and private agencies about this matter and we have set a goal to have this website shut down.
Thank you and have a good day.


This is one of the most responsible spudgun sites on the web, with zero tolerance towards discussions about explosives, shooting at living targets or property. If you want a target for your paranoia, take a look here. It is much easier for the average Joe to purchase a highly destructive shotgun than to build a spudgun.

JSR, maybe making a small, say .25" porting piston valve piloted with a Snapvalve.


um... this is essentially what I've made ;)
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 21, 2008 1:37 pm

I played around with this a bit more this afternoon, the power is certainly there - at 100 psi, I loaded a 0.25g BB in the "barrel" - the approximately 1" of 6mm tube that the piston feeds into - and it punched though a cardboard box easily.

I've seen what I want to see, this design certainly has potential and i will be developing something along these lines. The original idea was for a 6mm BB/pellet air machinegun, but now that I have the Monsoon doing just over 900 feet per second with 16 grain pellets, the idea isn't as appealing - so I'm thinking I could go one step higher in calibre and go for a marble shooting autocannon, time to retreat to the drawing board for a while.
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Unread postAuthor: POLAND_SPUD » Mon Jan 21, 2008 2:14 pm

yeah try with 1/2" marbles... or even ball bearings... lol this would be sweeeeeet :D

I still can't belive you acctually succeded.... well it seems it was worth all the effort.... 8)
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Unread postAuthor: ALIHISGREAT » Mon Jan 21, 2008 2:17 pm

The original idea was for a 6mm BB/pellet air machinegun, but now that I have the Monsoon doing just over 900 feet per second with 16 grain pellets, the idea isn't as appealing - so I'm thinking I could go one step higher in calibre and go for a marble shooting autocannon, time to retreat to the drawing board for a while.


*cough*deathray marble machine gun*cough* :D you're JSR we always expect something new and exciting from you :wink:
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 21, 2008 2:22 pm

ALIHISGREAT wrote:*cough*deathray marble machine gun*cough* :D you're JSR we always expect something new and exciting from you :wink:


ah, but the deathray doesn't eject cartridges ;p watch this space, I'm thinking of something a bit more heavy duty than my usual dainty little prototypes.
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Unread postAuthor: ALIHISGREAT » Mon Jan 21, 2008 2:28 pm

ah, but the deathray doesn't eject cartridges ;p watch this space, I'm thinking of something a bit more heavy duty than my usual dainty little prototypes.


cartridges are an unecessary complication, cool 8) but uneccesary... maybe a semi-auto/full-auto cartrage ejecting marble sniper?
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Unread postAuthor: Skywalker » Tue Jan 22, 2008 10:01 am

Jack, if you set the pop-off pressure to a fixed level so that the gun cycled slowly, could you then put a trigger valve between the compressor and the gun so you could select between semi and auto by how long you held the trigger?

Also, I think you should really go ahead and put one of your blow-forward breaches and a decent barrel on the thing, now that you have got it this far. If I were you, I'd do that and then use metal bb's instead of pellets. Then you could finally put the vortex/cloud bbmgs to shame!

One more q, what's the top cycling speed like?
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