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reverse plunger 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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reverse plunger pistol

Unread postAuthor: blind909 » Sat Feb 09, 2008 9:32 pm

THE RPP

this one is a little more complicaed, but worth it, it took me about 20 mins to make, and it shoots at around 380-390 fps. it is soooo easy to prime, and is quite good for its size, the barrel is about 7 inches, and the chamber is 1 inch pvc, clothespin trigger, pvc grip, 6 inch, 3/4 inch wide spring. to prime, pull the barrel forward, then pull the trigger, and it shoots. the barrel is the plunger on this gun, if you have any questions, just ask.

[img][img]http://img29.picoodle.com/img/img29/4/2/9/t_rpp002m_f1bd6ce.jpg[/img][/img]
[img][img]http://img03.picoodle.com/img/img03/4/2/9/t_rpp005m_fd1d989.jpg[/img][/img]
[img][img]http://img02.picoodle.com/img/img02/4/2/9/t_rpp006m_8512a23.jpg[/img][/img]
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Unread postAuthor: pizlo » Sat Feb 09, 2008 9:46 pm

Nice job, did you get the Ideas from nerfhaven? And great fps for a springer.
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Unread postAuthor: blind909 » Sat Feb 09, 2008 9:48 pm

i made one on nerfhaven, it is named the same too, but was made from 3/4 inch, my username is nerfer909, look for it.
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Unread postAuthor: ghostman01 » Sun Feb 10, 2008 1:04 am

any inside diagram on how it works or something very interesting ive been looking for a pistol for a while and i want to try to make this one !!



EDIT could we please get some parts lists and some internal pics i would like to know what parts you used thanks
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Unread postAuthor: OuchProgramme » Sun Feb 10, 2008 5:52 pm

Oooooohh...

380-390 fps didja say?

Wow.

Thats like competing airsoft gun.

I'll have to get the plans off of ya 8)
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Unread postAuthor: OuchProgramme » Sun Feb 10, 2008 5:53 pm

Sorry about double post :oops:
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Last edited by OuchProgramme on Sun Feb 10, 2008 9:09 pm, edited 1 time in total.

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Unread postAuthor: windshrike » Sun Feb 10, 2008 6:18 pm

400 fps out of a 7 inch barrel? I must try this. Interesting that you move the entire barrel, I imagined -at reading the title- a plunger moving backwards around a stationary barrel, the seals against the barrel exterior and against the inside walls of the chamber. Good job, blind.
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Unread postAuthor: blind909 » Sun Feb 10, 2008 7:31 pm

here are the plans, feel free to make one yourself, very simple.

[img][img]http://img33.picoodle.com/img/img33/4/2/10/t_rppdrawout2m_04d59d0.jpg[/img][/img]

click to enlarge.
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Unread postAuthor: blind909 » Sun Feb 10, 2008 8:24 pm

*bumpidy bump bump*
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Unread postAuthor: e1337 » Sun Feb 10, 2008 8:24 pm

How did you get the area near the spring air tight?
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Unread postAuthor: OuchProgramme » Sun Feb 10, 2008 9:10 pm

e1337 wrote:How did you get the area near the spring air tight?


Plunger w/ electrical tape.

Maybe you could modify it so that it could be a combo of o-rings and lubricant?

How strong is the "nitefinder" spring?

I have a couple springs i stole from some water systems, but i'm not sure if it'll do...
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Last edited by OuchProgramme on Sun Feb 10, 2008 9:15 pm, edited 2 times in total.

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Unread postAuthor: OuchProgramme » Sun Feb 10, 2008 9:12 pm

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Unread postAuthor: blind909 » Sun Feb 10, 2008 11:04 pm

e1337, do you mean the plunger?

ouchprogramme, why did you post a blank post?
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Unread postAuthor: jackssmirkingrevenge » Sun Feb 10, 2008 11:21 pm

I still think springers are a waste of time but I have to say, nicely done and kudos for making it work.
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Unread postAuthor: ghostman01 » Mon Feb 11, 2008 2:58 am

heres my piston
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