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Portable 6mm Semi

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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Portable 6mm Semi

Unread postAuthor: noname » Sun Oct 07, 2007 3:40 pm

This is my second 6mm semi auto, but this one actually works. It was very surprising to me, because I can never get anything aligned perfectly. I haven't shot with the barrel yet, but hooked up to unregulated propane, it can dump a 20 round mag in less than 5 seconds and shoot the BBs about 10-15 feet. This gun would be extremely simple if not for the blow forward bolt. A single shot version of this would be a piece of brakeline, a blowgun, an elbow, and a quick connect.
Instead, it uses (going from gas tank to barrel)
Propane tank
Propane Adapter
Female QC
Male QC
1/4" street elbow
Blowgun
1/8" close nipple
3" section of 1" Sch 40 PVC
1/4" aluminum rod
Solid Epoxy as a plug in the back of the PVC
Solid Epoxy bolt, with 5/16" and 1/4" brakeline
Spring
1" female adapter
1" plug
5/16" compression T
A couple mags made from a compression olive, nut, and 5/16" tubing
5/16" brakeline sleeved over 9/32" brakeline

I may add a stock to the gun, which is why I have part of the aluminum rod sticking out the back. I may also add a small BB shotgun underneath the barrel, as well as a rifle scope on top. I will almost definitely paint the gun (flat black).

It's not as cool as Jack's clear syringe for a blow forward tube, but a plastic syringe costs me almost $5.
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Attachments
semiauto 009.jpg
semiauto 008.jpg
Everything inside the PVC
semiauto 007.jpg
Barrel and mag setup
semiauto 006.jpg
Unscrewed barrel
semiauto 005.jpg
Without Barrel
semiauto 004.jpg
Detached Mags; I may make a hopper sometime
semiauto 003.jpg
The bolt is a 3/4" long piece of 5/16" brakeline (back) that slides over the 1/4" aluminum tubing. There is 1/4" brakeline epoxied inside the 5/16" brakeline, and an epoxy cylinder surrounds it all.
semiauto 002.jpg
Inside the blow forward tube
semiauto 001.jpg
The trigger and main body
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Unread postAuthor: VH_man » Sun Oct 07, 2007 3:44 pm

damage? FPS?

and i think you should add some kind of hop-up.

anyway, nice, its basically a dummed down version of jacks that allows EVERYONE to build one.

im building one of marble calibre sometime............
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Unread postAuthor: mopherman » Sun Oct 07, 2007 3:46 pm

looks great. I would have used a longer barrel because of the slow opening blowgun. does the bolt ever jam inside that tee?
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Unread postAuthor: noname » Sun Oct 07, 2007 3:49 pm

noname wrote:I haven't shot with the barrel yet


I forgot to mention the little hopup/ball stop. It's a tiny sliver (literally) of a rubber gasket which protrudes from the top of the T.

VH_man wrote:its basically a dummed down version of jacks


Thanks a lot.

You try making one; getting all those tiny parts right is [female doggy]!
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Unread postAuthor: noname » Sun Oct 07, 2007 3:52 pm

mopherman wrote:looks great. I would have used a longer barrel because of the slow opening blowgun. does the bolt ever jam inside that tee?


The barrel is 30" long. I guess I forgot to take pictures of how long it actually is.
The bolt has never jammed, but it occasionally knocks the 1/4" aluminum rod back. This is also why I'm not shooting it right now; I'm waiting for the epoxy on the rod to dry so it stays in place.
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Unread postAuthor: iPaintball » Sun Oct 07, 2007 3:54 pm

It's just like mine, except, 20 times bigger. :D I made one for .177 bbs out of a bored out 1/8" tee. I used a piece of a small spring as the bolt return. Now, THAT was a PITA!
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 07, 2007 4:05 pm

Well executed, nice to see the use of epoxy :D looking forward to seeing videos of it in action.
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Unread postAuthor: iPaintball » Sun Oct 07, 2007 4:30 pm

Ehem, where are my manners? Well don old bean! Is that marine epoxy?
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Summer Projects:
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Cane gun: Needs a pilot/fill setup
1.5" piston valve gun: Almost done
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Unread postAuthor: noname » Sun Oct 07, 2007 6:10 pm

Jack, I'm never going to have any videos of any of my guns, strafers or otherwise. It sucks major balls, but I don't have a video camera or near enough cash for one.
iPaintball, it's just regular Ace Hardware 2 part epoxy, nothing special (except it's 60 minute epoxy and took around a week just to dry :roll: )
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Unread postAuthor: VH_man » Sun Oct 07, 2007 6:16 pm

if it took that long to dry then you didnt mix it right..... i have Epoxy that NEVER dried.
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Unread postAuthor: noname » Sun Oct 07, 2007 6:22 pm

I did mix it right, because I inject it through 2 syringes, each with graduations of 1 mL on them. For tin ythings, I usually mix around 4 mL. Larger things, like the plug, took 15-17 mL of each. And yes, the ratio of resin to hardener IS supposed to be 1:1.

Updates:
Mounting a rail right now, to put a scope on.
Made another magazine; I have 3 now.
Adding a new hopup, the bolt spit the old one out.
Attached a new brass barrel that isn't bent like the previous aluminum one.
Making a stock out of aluminum rod.
Might make a handle or a place to put my left hand (either that, or make another and dual wield :D ).
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Unread postAuthor: hi » Sun Oct 07, 2007 7:21 pm

well im impressed. (i wish i had more to say)
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Unread postAuthor: windshrike » Sun Oct 07, 2007 7:24 pm

Nice build, but somehow, JSR's 415 fps appeals to me more than yours shooting bbs 10-15 feet.
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Unread postAuthor: noname » Sun Oct 07, 2007 7:29 pm

Taking into consideration that he has a 2-3 foot barrel and mine is about 1/2" may broaden your thinking....
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Unread postAuthor: windshrike » Sun Oct 07, 2007 7:33 pm

Oh crap man, I'm sorry, I thought your barrel was just cut off in the pics.
I like how it can be taken apart, with JSR and epoxy it's it works forever or you're screwed.
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