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M21E600 semi automatic bullpup marble cannon.

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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M21E600 semi automatic bullpup marble cannon.

Unread postAuthor: Crna Legija » Thu Apr 21, 2011 11:16 am

iv been building this on and off for about 2months, its not finished just yet but fully functional. only needs to be sanded and painted

SPECS
Barrel: 650mm of 20mm electrical conduit, its really loose 1mm each side :( need a upgrade.
ammo capacity: one 20 round mag and two 10 round clips. all spring fed, homemade springs.
Valve:1/2'' festo qev, 10mm seat.
Pilot Valve: 1/8'' pantball slide valve.
Chamber: 10cm of 3/4'' galvanized pipe. small but 600psi makes up for it :twisted:.
Operating pressure: 200-600 psi, with my 1l tank i get 20 really good shots 10good shots, then i refill it.
Reload mech: homemade air cylinder to cycle ammo, the receiver is two brass tees with a peace of 20mm copper pipe soldered in it.

thanks to Poland_spud and jsr.
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Attachments
rightftont.jpg
you can see the groove cut in the wood for the trigger to ride in.
rightftont.jpg (35.71 KiB) Viewed 4605 times
red dot.jpg
the red dot sight, i cant get a good pic. its on the macro setting
red dot.jpg (13.67 KiB) Viewed 4604 times
resiver.jpg
this is a old pic, of the receiver. it looks the same but i re-made the pvc parts in copper and solderd them in.
resiver.jpg (31.72 KiB) Viewed 4604 times
fullside.jpg
that is the hole thing. needs some finishing touchs. I have two aluminum plates that cover the valve and trigger rod.
Last edited by Crna Legija on Fri Apr 22, 2011 7:46 am, edited 3 times in total.
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Unread postAuthor: Doctore » Thu Apr 21, 2011 11:25 am

hey this is awesome :o

You can use it as paintball sniper rifle
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Unread postAuthor: Alster370 » Thu Apr 21, 2011 1:07 pm

The stock seems quite chunky, but very nicely done anyway. I think a caliber of that size at the pressure you intend to operate could do some serious damage. :D Post a video?
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Unread postAuthor: POLAND_SPUD » Thu Apr 21, 2011 3:06 pm

Now that's pretty cool


Can't wait to see it fully painted - I bet it will look a lot like Tavor assault rifle

the red dot sight
It's one of those cheapo chinease reddots, right ?
I've always wondered if they're any good?
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Unread postAuthor: al-xg » Thu Apr 21, 2011 3:27 pm

So air ram connected to chamber loads ammo from behind the QEV ?

Does the trigger close the fill valve and pilot in one action ?

Looks good !

I have a cheap red dot, the main issue, is the dot will wander slightly if you move your head. If there is a stock on the gun and the cheek rest is used it is OK.
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Unread postAuthor: POLAND_SPUD » Thu Apr 21, 2011 3:43 pm

I have a cheap red dot, the main issue, is the dot will wander slightly if you move your head.
I don't think that's surprising... they are to behave in that way.... the only question is how well does this feature work
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Unread postAuthor: al-xg » Thu Apr 21, 2011 4:19 pm

A good red dot sight should stay on target even if your head moves, cheap ones drift. So unless you resume the exact same position when looking through the sight, the point of aim will be slightly different.
I tried a $600 EOtech and I definitely didn't drift like my cheapo one does.
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Unread postAuthor: jhalek90 » Thu Apr 21, 2011 8:18 pm

looks awsome.
We need a video of this beast!

Also, what color are you going to stain/paint it?
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POLAND_SPUD wrote:Anything is possible with the proper 3-way valve.
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Unread postAuthor: Crna Legija » Thu Apr 21, 2011 11:25 pm

Alster370 wrote:The stock seems quite chunky, but very nicely done anyway. I think a caliber of that size at the pressure you intend to operate could do some serious damage. :D Post a video?


the stock is only 45mm thick, i cbfed sanding it more round and its stronger this way. ill get a damage pics soon and if i can find something to protect my video camera ill have videos

POLAND_SPUD wrote:
the red dot sight
It's one of those cheapo chinease reddots, right ?
I've always wondered if they're any good?


yea, i only got it for look it was only 68 cent and free delivery. the rail i made at work (on the mill wooot) they dont let me use it much :(

al-xg wrote:So air ram connected to chamber loads ammo from behind the QEV ?

Does the trigger close the fill valve and pilot in one action ?

Looks good !


yea that how it works, the trigger pilots in when you pull back and fills when you let go, i have a safety that stops it coming back if you engage it.

jhalek90 wrote:looks awsome.
We need a video of this beast!

Also, what color are you going to stain/paint it?


im going to paint the top 1/3 black to cover all the epoxy putty and walnut stain the rest. then if it looks stupid mate black everything. ill lever the alu riser and rails alone


thanks for the comments guys
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Unread postAuthor: YEAHADD16 » Mon Apr 25, 2011 3:18 pm

This is really cool. About how heavy is the whole thing? Also, what are you using for an air chamber? How is the feeding of paint balls? Everything is so neat and has similar specs I would like to accomplish on my build. Great work !!! :D
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Unread postAuthor: Crna Legija » Tue Apr 26, 2011 2:58 am

YEAHADD16 wrote:This is really cool. About how heavy is the whole thing? Also, what are you using for an air chamber? How is the feeding of paint balls? Everything is so neat and has similar specs I would like to accomplish on my build. Great work !!! :D


Hmmmm im not sure id say about 2.5-3kg + 1kg for the fire extinguisher tank, Its a marble cannon i don't use paint balls, it would most probably mush paint balls if i did use them.

In other news i painted the top bit black and will stain the rest tomorrow. expect vids/new pics soon.
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Unread postAuthor: jackssmirkingrevenge » Tue Apr 26, 2011 4:00 am

Crna Legija wrote:expect vids/new pics soon.


Looking forward to them :)

If I could make a small aesthetic/safety suggestion, it needs a trigger guard.

What's performance like? I've found marbles that fit very well in 20mm conduit (17mm) so maybe some searching is in order to reduce blowby and optimise velocity.

A diagram of the feed mechanism would also be of interest if you have the time ;)
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Unread postAuthor: Crna Legija » Tue Apr 26, 2011 4:33 am

jackssmirkingrevenge wrote:
Crna Legija wrote:expect vids/new pics soon.


Looking forward to them :)

If I could make a small aesthetic/safety suggestion, it needs a trigger guard.

What's performance like? I've found marbles that fit very well in 20mm conduit (17mm) so maybe some searching is in order to reduce blowby and optimise velocity.

A diagram of the feed mechanism would also be of interest if you have the time ;)



defiantly need a new barrel, im looking. i might be getting 500 15mm ss bbs for free, if so i have a steel barrel id is 15.07mm i would just need to get 1/2'' bsp threads on one end, but i can do that at work.

but the power is pretty good for the barrel, easily puts marbles though 9mm mdf boards.

i made a safety that when you push it in the trigger cant be pushed back, and the trigger is really stiff so i don't think it needs a real guard
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Attachments
internals.jpg
you should be able to figure the rest out
internals.jpg (21.58 KiB) Viewed 4221 times
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Unread postAuthor: cammyd32 » Sun May 01, 2011 3:51 pm

Cool, nice gun. so does it run just from the pressure in the galvanized pipe, it isn't attached to a separate tank or air compressor?, cos if so i might nick that idea.
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Unread postAuthor: Gun Freak » Sun May 01, 2011 4:06 pm

Yes it needs a tank or a compressor to run.
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