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multi shot BB gun/rifle

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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multi shot BB gun/rifle

Unread postAuthor: Cosmic Muffin » Sun Nov 16, 2008 7:16 pm

Gday guys this is a spare parts gun that i made yesterday, which took a little over 3 hours to make, pretty good i thought. the construction is steel pipe (chamber and reducer etc.) with PVC (T and random spacers and joiners)
this gun was designed on the principles of one of Ants hammer valve ideas. so cheers for that Ant. i cant take the gun apart at the moment but will have pictures of the internals up in no time.

the piston or bolt is a large screw with the 'screw' cut off leaving only the head which then had a hole drilled in it to accommodate a section of tent peg which is the "firing pin" in essence.
a Neoprene O-ring was place inside the reducer and when the bolt is slid in, it seals off the chamber.

An epoxy filled 1.5cm section of pipe with a hole drilled in the center was slid into the back end of the T. this then had the firing pin sticking out of it.
the direction of the air flow is from the chamber, up to the barrel through the top of the T.
i wanted to keep dead space to a minimum without restricting airflow, so i filled up most of the tee with epoxy putty. the barrel is just pushed into the top of the T and is approximately 6.03mm ID.

the Nerf Nightfinder which i modified to hold the steel section of the gun, had the spring cut down, and the end of the gun removed. this then had the molded PVC screwed to it (slightly unstable i know, but this gun is only a prototype) the idea of the Nighfinder was to activate the valve by striking the pin. this works like a charm :) with the spring being an optimum strength so as not to keep the valve open.

This is the most powerful BB gun i have made to date with the range being quite large at only 60 psi , although i have no way of measuring the true range. I am most proud of it. i still have lots of modifications and bodywork to do, as this is just a prototype.
sorry for writing an Essay, hope you have time to read it.

Constructive criticism is welcomed :wink:

<a href="http://tinypic.com" target="_blank"><img src="http://i34.tinypic.com/30aavdz.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

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Unread postAuthor: pocket » Sun Nov 16, 2008 8:04 pm

beautiful try asking your friends to play Nerf wars with you now lol
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Unread postAuthor: blind909 » Sun Nov 16, 2008 8:27 pm

sorry for writing an Essay, hope you have time to read it.


Dont you think that should have came first :lol:
BTW, Nice gun.
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Unread postAuthor: VH_man » Sun Nov 16, 2008 9:37 pm

I have always thought about doing this, but never really got around to it.... I should really get on the fact I have a few of those crappy 150 FPS airsoft "mini's" sitting in my basement.........

Nice Job.
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Unread postAuthor: SEAKING9006 » Sun Nov 16, 2008 9:52 pm

I used to have two minis, and that was before spudguns ever crossed my mind. Needless to say, I scrounged together every piece of scrap I could fit on those things, and made those things into full size SMGs, through the magic of painter's tape, along with the luck of things just happening to 'fit'. Those things looked like frankenguns. I even took a sharpie to the mini-uzi and made the whole thing black(dark purple).

Those things are fun to mess with.
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Unread postAuthor: Skywalker » Thu Nov 20, 2008 9:08 am

Nice work! I like the judicious use of pre-existing components (ie, modding the nerf gun)! It makes me want to try my hand at a hammer valve gun.
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Unread postAuthor: Cosmic Muffin » Fri Nov 21, 2008 4:55 am

aha cheers, yer the Nerf gun was just lying round so i decided to make it shoot something that actually hurts :D
well you should try it ay, i mean i made this beast in a day, all you need is the right parts and its very simple.
i was thinking of a design change though. like covering it up with a few bits of aluminum or something , just to make it look more like a gun and less like a piece of junk :P
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Unread postAuthor: airheadnoob » Sun Nov 30, 2008 1:26 am

GOD DAMN IT i just bought 1 of those nerf guns at toys r us and through it out but good job can u do a shooting video plzzz
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Unread postAuthor: Cosmic Muffin » Mon Dec 01, 2008 8:53 pm

haha dont you just hate that.. yeah well i would try to get a video up but im not sure how i could, i dont have a vid camera and my mobile doesn't have a direct link/usb to the computer :?
but if you can imagine, a gun that shoots a bb through 15mm of carboard. btw im not sure if thats too special or what, but i havent actually tested it to its max capacity :wink:
cheers for the post
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