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Portable Airsoft Gun take 2

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Portable Airsoft Gun take 2

Unread postAuthor: noname » Sat Sep 19, 2009 11:01 am

So I took apart the old one because it was too cumbersome and figured out a much more compact bullpup configuration. The gun also looks a whole lot better than the first.
I also wanted a better magazine system than a hopper on top. The hopper was annoying and got in the way and it was pretty much crappy in general.
I also added a front handle; now the gun is more like a submachine gun.
Unfortunately, I haven't been able to make a good magazine for it, but I'm going to Ace again today for some more parts. I have a spring fed design that I'm fairly sure will work this time.

Make sure to read the captions on the pictures of the two magazines to get an explanation.
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Attachments
DSCF3913.JPG
Right side. AS you can see, the gun is literally built around the propane tank, making it very compact, yet still portable.
DSCF3918.JPG
Left side
DSCF3919.JPG
Left side detail
DSCF3921.JPG
Down the barrel?
DSCF3915.JPG
First magazine. Very simple; it's just a vinyl hose that ran from the T breech to the blowgun vent. The idea was that when the blowgun was vented, it would load one BB into the breech and the main valve would fire it. Unfortunately, the blowgun was too strong and simply blasted 10-12 BBs down the barrel, assisted by the main valve. This turned the gun into a semi automatic shotgun. Cool, but not what I wanted.
DSCF3916.JPG
Tube magazine attached. It can easily be disconnected from the breech T.
DSCF3914.JPG
This is the spring fed magazine that I made after the tube magazine failed. It is a short section of 1/2" SDR PVC and holds 49 rounds. Unfortunately, the spring just jammed it, due to the large magazine diameter and the small breech diameter.
DSCF3917.JPG
Spring fed magazine attached.
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Unread postAuthor: jackssmirkingrevenge » Sat Sep 19, 2009 11:11 am

Looking good, hope to see it in action soon :)
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Unread postAuthor: noname » Sat Sep 19, 2009 11:14 am

Looking better than the last one at least. :?
A spring fed mag should work better (less jamming) it's the same diameter as the barrel/breech, right?
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Unread postAuthor: POLAND_SPUD » Sun Sep 20, 2009 1:46 am

as I said earlier you might as well use a hup-up unit with a magazine from an airsoft gun...
but AFAIK that's just a simple T + spring fed mag
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Unread postAuthor: noname » Sun Sep 20, 2009 10:49 am

I have a working spring fed mag now, made from a 5" long piece of 1/8" steel pipe. Stuck a couple springs in and put an end cap on and it works fine. Unfortunately it feeds too many at once.
So now I'm making another blow forward bolt, but a simple design that will work as soon as I get a drill bit from Ace.
I'm making it so it doesn't work as well as a "normal" blow forward bolt does, but it will do the job, which is cutting the mag off every shot.
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