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MGL Stock

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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MGL Stock

Unread postAuthor: Procyon » Thu Nov 05, 2009 3:11 pm

I'm working on a 7 shot semi-auto revolver type 40mm grenade launcher. I've got the body and main air complete but still need to start work on the trigger assembly and mount the control air devices. At 32 inches long and around 18 pounds unloaded it's designed to be carried and maneuverable. Testing so far is favorable.

Below are some pics of the stock before and after finishing. The stock is made from PVC sch 40 electric conduit that I heated in the oven then pressed to shape over a 2x6 with a piece of pipe resting on top. Cut out was done with a hacksaw blade and hole saw. The walnut veneer is finished with 3&1 oil since that’s the oil I carry with my when I shoot. The inside of the stock wil be painted flat black.

I'll post a before and after of the gun once I apply the finishes to the gun body.
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unfinished stock.JPG

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Unread postAuthor: Technician1002 » Thu Nov 05, 2009 3:20 pm

Wow, Well done for a PVC construction. How hot was the oven to soften the pipe?
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Unread postAuthor: Procyon » Thu Nov 05, 2009 3:30 pm

350 to 360 tops. Any more and there is a risk of bubbles and the piece could be ruined. It should bend like leather when it's ready.
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Unread postAuthor: maverik94 » Thu Nov 05, 2009 4:11 pm

Wow, that looks nice, how did you make that stock look like actual wood? What kind of finnish did you use?
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Unread postAuthor: twizi » Thu Nov 05, 2009 4:18 pm

i would talk to solar he has a copy right on it probaly so dont copy and he got some buyers like army and airforce i belive
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dont play with airsofter with 1000$ gun and play with a 5 dollar pair of glasses
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Unread postAuthor: Procyon » Thu Nov 05, 2009 5:26 pm

It is real walnut. There is a self- adhesive backing with a peal off liner. The finish is with oil.

http://www.rockler.com/product.cfm?page=2213

Copyright? You must be kidding!
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Unread postAuthor: POLAND_SPUD » Thu Nov 05, 2009 6:30 pm

he has a copy right on it probaly
I don't get it... on what exactly??

@procyon
any chance to see pics of the whole gun ?? how does it work?
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Unread postAuthor: Procyon » Thu Nov 05, 2009 8:42 pm

The gun is modeled after the Milkor MGL-140.

http://www.milkorusainc.com/gallery.html

It's to early to show as I still have the trigger and air control circuit to install. The pic below is the body and main air. Once complete I'll gladly post more details on its construction and how it was made along with credits to those persons who's idea's were incorporated into the design.

The body is made almost completely out of SCH 40 PVC electric conduit as it is easy to shape. The pressure camber is SCH 80 pressure pipe with the balance of the pressure pipe being copper. The cylinder is operated by an air piston. I'll get into more details if requested when construction is completed. I intend to post detailed photos of the disassembled components along with the finished product. About 3 weeks since I'm leaving on vacation soon.

The concept was to construct the gun using common hardware parts with basic hand and power tools. I used a drill and a hacksaw.
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Unread postAuthor: maverik94 » Thu Nov 05, 2009 9:29 pm

DUDE!!!!! That gun looks kick ass!!!!!!! And I don't know how to say this, you look perfect in that picture!!!!!!(in a non-gay way) I can't wait to see that beauty in videos etc!!!!! Don't worry about a copyright, this looks nothing like Solar's Eclipse, This may even look cooler!!!!! Awesome job Dude!!!
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Unread postAuthor: Ragnarok » Thu Nov 05, 2009 9:32 pm

Twizi, in future, I would suggest that you spend a little more time thinking before posting - you are frequently a source of misinformation that paints you in a poor light.

Solar does not have copyright on 40mm launchers. He doesn't even have copyright on 40mm pneumatic semi-autos using a rotary magazine.
He has patents on parts of the Eclipse design, but that's it.

You're misunderstanding copyright vs. patents.

As I understand it (and I recognise that I'm not as clued up on these things as I should be...)

Copyright protects creative intellectual property like art, music and writing, and is pretty much automatic. If you created it (and didn't copy from someone else in the process), you have copyright.
Patents protect engineering design, and have to be registered.

Either way, I personally have copyright (my art being the obvious example). I do not have patents (yet, at least.)

Next point. If I take someone else's creative art for personal use - copyright theft. If I claim it's my work, that's more trouble. Selling it as if it were mine is even more issues.
If I were to look at something under patent, and copy it for personal use, that's not patent theft. Cheeky, yes, but legal. Claiming it's my work or copying it to sell... that would get me in trouble.

Either way, next time, you'd do well to keep quiet unless you actually do know what you're talking about.

I almost always work by that rule.
You have no idea of the number of posts I don't make on the forums - I see so many places where I could say something but don't, and many times where I write a lengthy post only to completely scrap it.
I don't like posting guesses (I've had people take my totally wild guesses as fact before... that was a mess and three halves.), and when I do guess, I always say so. Indeed, I did almost exactly that above - I'm far from an authority on copyright.

Odds on, if I didn't work the way I do, I'd have more posts than Jack - and be taken dramatically less seriously.

~~~~~

Anyway, getting back to the point.

Pretty (and) impressive... I'll be waiting to see the end result.
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Does that thing kinda look like a big cat to you?
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Unread postAuthor: rikukiakuchiki777 » Fri Nov 06, 2009 2:17 am

I've always liked the gun you modeled this off, and as a result I really like this :D. I'm looking forward to seeing the completed product.

Is there some sort of reloading mechanism? I assume that the chamber won't pop out similarly to the real thing due to the air tank, but do you have any other ideas? What do you plan on using for ammunition?

Also what were the dimensions of the electrical conduit you used for the stock?

Again, nice work.
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Unread postAuthor: iknowmy3tables » Fri Nov 06, 2009 3:13 am

to expand on what Ragnarok said, I recall a discussion when the eclipse was brought to this site that Solar clarified that he would not sue use if we made our own eclipse style guns if unless we attempted compete with his business using his designs
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Unread postAuthor: inonickname » Fri Nov 06, 2009 6:43 am

twizi wrote:i would talk to solar he has a copy right on it probaly so dont copy and he got some buyers like army and airforce i belive

I'd be inclined to say that he would take a look-a-like or a replica or even anything resembling his models to be a compliment rather than a threat. If you read up on patents and the like, things could be amazingly similar without breaching a patent.

On topic; amazingly good work with PVC good chap. I can't wait to see the mechanism you've come up with the rotate the revolver assembly.

I'll get into more details if requested when construction is completed. I intend to post detailed photos of the disassembled components along with the finished product.

Awaited eagerly.
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Cylinder Advance

Unread postAuthor: Procyon » Fri Nov 06, 2009 7:56 am

Attached is a 2d drawing of the cylinder advance and loading plate. The plate rides on the back of the cylinder and rotates 1/7 of a turn with each shot. The tab on the right contains a spring and roller that locks into groves cut into the cylinder in clockwise motion only. The tab on the left is the loading port. Side the tab out to remove or load the ammo. The cylinder advance is driven by an air piston made from 1/2" and 3/4" copper pipe. When the air chamber is charged the piston advances the plate one step. When the gun is fired the plate is pulled back by a spring ready to repeat the cycle again. The frown looking cut out above where the plate slides over the air chamber is most important of all. It provides passage for a rod connected to the trigger and provides the final line up of the cylinder to the barrel. If the cylinder is not aligned to with-in 1/32" the gun will not fire. There is a manual 3-way valve by the trigger hand thumb that will manually advance the cylinder allowing you to use a variety of ammo and pick which ammo to use on a given shot. By opening the ammo door and pointing the gun up, you can use the manual advance to eject the cartridges from the cylinder. I've tested all the components and they work a designed but have yet to put them all together on the gun at once as I'm still working on the trigger mechanism. Once this is done I'll break down the gun prior to painting and photo it. I believe this photo along with a brief narrative and credit links will provide all the info one needs for construction. About 3 weeks.

The ammo is a cartridge. I've tested them and they scream. I'll post separately on the ammo. They are made with a piece of 1 1/2" pvc and bushings cut from an 1 1/2" and 1" coupling. Both ends are sealed with foam.
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Unread postAuthor: inonickname » Fri Nov 06, 2009 8:40 am

How hard did you find it to create a mechanism to allow travel only in one direction, while still allowing the air cylinder to reset? Several commercial things that could be adapted come to mind, such as a cheap fishing reel.
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