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Mini guns

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Mini guns

Unread postAuthor: inonickname » Fri Jan 15, 2010 9:55 am

Well I've had some interest in miniatures for a while so I thought I'd try my hand at a small gun (as in non-firing). It's based loosely on the M40A3 (except using a wooden stock rather than a composite one, and lacking the bipod and scope until I get around to it. I machined the barrel and bolt from solid stock (and the stock from a chunk of wood).

It came up pretty well, unfortunately the shitty camera doesn't do it justice. The stock is stained, the barrel is blued and so on. The bolt works quite well and is very smooth. Not too much to say about it..

(The camera doesn't do anything justice)
Image
Image
Image
Image

I'm wondering what direction to go next..I was thinking of a half size air rifle or machining a breech with miniature dummy shells which when the bolt is cycled, are ejected (then the next one loaded). If I go with the air rifle I was thinking of fitting it into a Walther WA 2000 or finding a nice pre-existing air rifle to replicate.

Any thoughts, ideas, comments, opinions, your own builds etc.

TO CLARIFY, THIS IS NOT A POWDERBURNER AND NEVER WILL BE.
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Unread postAuthor: jackssmirkingrevenge » Fri Jan 15, 2010 10:20 am

Nice, how long is it? Also, surely you could make some tiny shellsin this veinand have it firing? It wouldn't be a powerhouse, but it would work ;)
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Unread postAuthor: inonickname » Fri Jan 15, 2010 10:30 am

Roughly 40cm long. Those cartridges would push the scale pretty badly so I'd prefer to do a pcp setup.

Edit:
Image
Anyone know what this finish is and how it's applied? The author refers to it as jeweling though I could not find anything about it.

Edit:
Found this in a sea of stainless steel food consumption wares. Snailing.
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Unread postAuthor: maverik94 » Fri Jan 15, 2010 4:10 pm

WOW, beautiful!!!!! It's cool without firing, but a firing version would absolutely be AMAZING!!!!!!!
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Unread postAuthor: Gippeto » Fri Jan 15, 2010 4:32 pm

Sometimes refered to as "engine turned", use a pencil in a drill press with a bit of light abrasive/polishing compound.


Edit: Checked your link after the fact... :oops:
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Unread postAuthor: inonickname » Fri Jan 15, 2010 8:41 pm

maverik94 wrote:WOW, beautiful!!!!! It's cool without firing, but a firing version would absolutely be AMAZING!!!!!!!

It wont ever be a firing powderburner though I'm looking for a PCP setup to replicate. Any ideas?
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Unread postAuthor: Gippeto » Fri Jan 15, 2010 10:31 pm

Ideas you ask?? :D

The "Raven" by...an Englishman with some rather..."special" permits it seems. :wink:

One of a kind. (prototype) The final version fires a flechette type round (11mm) at ~1600fps on 6000psi helium IIRC. Makes ~300fpe. :twisted:

Builder claims moa accuracy at 100yards.

Partially balanced spool valve configured as a hammer valve. (Something like the Brocock cartridge) If I "read between the lines" correctly. The builders posts were somewhat cryptic for legal reasons. (He sold the patent.)

I REALLY like this one. 8)
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Unread postAuthor: daberno123 » Fri Jan 15, 2010 10:51 pm

Got a link for any more info on that gun Gippeto? Looks mighty impressive. :D
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Unread postAuthor: Gippeto » Sat Jan 16, 2010 12:27 am

Go here;

http://talonairgun.com/forum/

Do a search for "Dave(Spooky)"

You'll find pictures of what seem to be two pre-flechette prototypes. Of interest is the larger diameter reservoir/chamber on the black prototype pictured.(Likely the later rendition.) :idea:

Most of the actual information is in the thread on Practical machinist.

http://www.practicalmachinist.com/vb/sh ... l?t=127421

Reading it over again, it seems the velocity claim was "just under 1950fps". :shock:

Ssssmokin! :)
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Unread postAuthor: POLAND_SPUD » Sat Jan 16, 2010 7:24 am

the gas ram that replaces the tube actuation springl
so do I get it tight ? it's a spool valve but air piloted (or via an air cylinder whatever) ?
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Unread postAuthor: Gippeto » Sat Jan 16, 2010 11:27 am

POLAND_SPUD wrote:so do I get it tight ?


Ask yer gf.... :lol:

Moving on...

I don't know for certain. As I interpret the builders remarks, he uses a gas ram (air spring to us) in place of a more conventional hammer spring.

If you look at the "other" pictures on the TAG, there is not venting on the rear of the chamber/reservoir, which leads me to believe the valve is not pneumatically actuated.

But IMO, pneumatic actuation would offer more power.
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Unread postAuthor: twizi » Sat Jan 16, 2010 12:10 pm

the link have gone bad on my computer
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Unread postAuthor: psycix » Sat Jan 16, 2010 12:28 pm

Looking nice.
I think rounding the back part of the stock would improve it further.

Why not slap on the same kind of system as old shatterhand from BTB?
Multi-shot hammervalve with breachloading bolt.
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Unread postAuthor: jackssmirkingrevenge » Sat Jan 16, 2010 12:31 pm

psycix wrote:Why not slap on the same kind of system as old shatterhand from BTB?
Multi-shot hammervalve with breechloading bolt.


I think that would be feasible, you could use a schrader as a hammer valve ;)

so do I get it tight?


Not after a couple of months you don't :roll: thanks for spotting that Gippeto :D
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Unread postAuthor: inonickname » Sat Jan 16, 2010 12:38 pm

psycix wrote:Looking nice.
I think rounding the back part of the stock would improve it further.

Why not slap on the same kind of system as old shatterhand from BTB?
Multi-shot hammervalve with breachloading bolt.

The M40A3 isn't the roundest gun around :wink: .

I've used schrader valves (successfully) as hammer valves, but they tend to have restrictive flow and need a lot of modification to work well. it's just as simple (especially if I'm turning a miniature HPA tank to use as a chamber- larger diameter) to make the valve from stock.
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