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Old November 24, 2022, 09:42 PM   #1
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Join Date: November 19, 2017
Posts: 126
20mm build

Since apparently the 500 Jeffery was much less of a challenge to build than I thought, and EForms has been running well recently, I grabbed some 20mm parts and will be doing the world's dumbest home-built DDs.

Have an old Colt M12 parts kit, a full sized vulcan barrel, and a 16" barrel stub.

The remill on the old colt will be decently easy. Not expecting any issues with that, I've got the semi conversion figured out on paper, and the rest is just welding/machining. Making a magazine will be fun but not impossible.

It's the second gun that I'll have issues with. I plan to make a stubby truck rifle just for giggles. 16" barrel means I can throw a stock on it.
Plan to make it look like the Noreen ULR but with Downs syndrome.
My issue is there is zero information on bolt design, and just using shear calculations, and some messing around, it looks like I'm just going to make the receiver and bolt as a very large mosin.

If anyone has built a 20mm single shot/non-auto 20mm, advice would be super appreciated.
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Old November 24, 2022, 09:44 PM   #2
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The part I'm most excited about on the MK12 is that it will be chambered for normal 20x102 Vulcan, not the navy's moronic 20x110 USN stopgap cartridge (which is the reason these kits are almost free).
The vulcan barrel isn't wide enough at the breech to thread directly for the receiver.
So i'll need to make a sleeve for it.
Recoil and gas system will also need tuned.
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Old November 25, 2022, 08:42 PM   #3
50 shooter
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Join Date: August 6, 2002
Location: SoCal PRK
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Have you looked at Anzio Iron Works 20mm?
I see the world thru bloodshot eyes
Streets filled with blood from distant lies
The dogs of war never compromise,
No time for rearranging.
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