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Reverse plunger pistol plan GUN FINISHED!!

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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Reverse plunger pistol plan GUN FINISHED!!

Unread postAuthor: ghostman01 » Mon Feb 11, 2008 4:38 am

heres what i made of blind909's pistol im bout half threw making mine
mines got a 17cmx32mm chamber and i havent worked out my barrel size yet

update 2#
ok it finished the spring is from an old pnuematic door closer very powerfull i shot my self in the stomach from 50cm away and ive still got welt 3hours later lol hurts....
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Unread postAuthor: pizlo » Mon Feb 11, 2008 8:15 am

Are you using a clothespin trigger/catch mechanism?
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Unread postAuthor: fretmelter » Mon Feb 11, 2008 9:20 am

wait wouldn't that make a vacuum at the barrel? or am i mistaking, its kinda hard with the picture versicle.

ok nvm i got it....that is pretty intelligent

but how are you going to ensure the bb doesn't come out prematurely?
it would create a slow pressure increase as opposed to having it rush out all at once when the pressure reaches maximum potential
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Unread postAuthor: blind909 » Mon Feb 11, 2008 9:56 am

yes it will make a vaccum, thats why you prime it then load it.
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Unread postAuthor: ghostman01 » Mon Feb 11, 2008 4:21 pm

exactely umm yeh how would you do that keep the projectile at the end maybe put a tiny bit of silicon in the inside ?? might work
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Unread postAuthor: ghostman01 » Mon Feb 11, 2008 4:22 pm

exactely umm yeh how would you do that keep the projectile at the end maybe put a tiny bit of silicon in the inside ?? might work i havent work out my trigger yet but it has to be strong as im trying to get a good sized spring
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Unread postAuthor: blind909 » Mon Feb 11, 2008 5:58 pm

btw, you dont need the rubber band on the trigger, it holds just fine without, also, what is your plunger made of? and lastly what diameter(in the si system) is 32 mm?
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Unread postAuthor: OuchProgramme » Mon Feb 11, 2008 8:45 pm

For the trigger...

All you need is a nail long enough to sustain the power of the spring w/ plunger...

It needs to be able to block it but move enough so that the it doesn't interfere w/ the plunger's movement.

Pretty simple, i think you over did it
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Unread postAuthor: ghostman01 » Tue Feb 12, 2008 12:13 am

yea well stilll i havent made it yet

@ blind its 32 mm and my piston is made froman old rubber door stop has the bes fit ever in the chamber and the suction is amazing and the rubber band is to pop it back in automatically
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Unread postAuthor: hotknife ralphie » Tue Feb 12, 2008 4:46 am

I don't suppose you know where you got or what brand the doorstop was? I have some 32mm pipe laying around and tried to size some doorstops for it. They were all either a tiny bit too big or too small.
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Unread postAuthor: ghostman01 » Thu Feb 14, 2008 12:22 am

nope just found it lying around
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Unread postAuthor: Carlman » Thu Feb 14, 2008 12:28 am

hotknife ralphie wrote:I don't suppose you know where you got or what brand the doorstop was? I have some 32mm pipe laying around and tried to size some doorstops for it. They were all either a tiny bit too big or too small.


if they are a tiny bit too bit just take some sandpaper to them
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Unread postAuthor: ghostman01 » Thu Feb 14, 2008 12:47 am

i dont know if mines to big because i need a decent spring to push it back so ive found but it seems to be easy to push with my hand ?? i lubbed it up with vaseline and it moves smooth easi and creates alot of air and suction if i pull it the other way ive also made a new trigger system for mine heres the pics
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Unread postAuthor: hotknife ralphie » Thu Feb 14, 2008 7:19 am

How is the performance on it? Also what size spring have you got in it? Approximately the same size as the chamber I would imagine, better to check though :)
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Unread postAuthor: ghostman01 » Fri Feb 15, 2008 12:03 am

amazing enough i havent got a spring yet
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