My 20mm project part 3 - Page 1

[ARCHIVED THREAD] - My 20mm project part 3

Posted: 1/3/2016 12:49:46 AM EDT

Archived Original thread

Built the axle out of spare donut tires, miata hubs n spindles turned on a lathe to fit inside the tube. Cut the ratcheting portion of a damaged tripod front leg and welded it all together. I did it this way so if I hated it, the tripod can be returned to original.

Next up is to make the faux armor shield.

Posted: 1/3/2016 12:51:45 AM EDT

[#1]

where did you get the barrel?

Posted: 1/3/2016 9:48:58 AM EDT

[#2]

jestertoo, that's a good looking DD.

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Quoted:
where did you get the barrel?

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Looks like a surplus M61 barrel. I see them now and then on auction sites.

Posted: 1/3/2016 7:01:22 PM EDT

[#3]

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Quoted:
jestertoo, that's a good looking DD.

Looks like a surplus M61 barrel. I see them now and then on auction sites.

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Quoted:
jestertoo, that's a good looking DD.

Quoted:
where did you get the barrel?

Looks like a surplus M61 barrel. I see them now and then on auction sites.

A fellow in Tennessee that goes by the name shady grady on GunBroker has new in tube M61 barrels at $1200 each. Also, CDVS.US.com has M61 barrels in various grades. Another source for 20mm barrels is Pac-Nor Barreling in Oregon. They make 20mm barrel blanks up to 45" long; see their website for details (www.pac-nor.com).

Posted: 1/3/2016 7:35:32 PM EDT

[#4]

Could you PM me the info on the guy who built your breech block? I would love to get a 75mm or 105mm sliding breech block made for a bag gun.

Posted: 1/3/2016 8:41:45 PM EDT

[#5]

I had good luck on 1919 forum asking around.

Posted: 1/6/2016 6:04:08 PM EDT

[#6]

Mocking up the faux armor with some cardboard

Forward of the axle looks better IMHO, but limits traverse of the action. Or I have to make the armor section thinner.

Forward of the axle

Aft of the axle

Posted: 1/6/2016 6:47:20 PM EDT

[#7]

Nice project, they are always fun.

Posted: 1/7/2016 1:34:42 PM EDT

[#8]

just my opinion but i would extend the armor over top of the wheels, its a very narrow wheel well so it looks funny and would offer very minimal protection in the current setup.

Posted: 1/7/2016 2:25:20 PM EDT

[#9]

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Quoted:
just my opinion but i would extend the armor over top of the wheels, its a very narrow wheel well so it looks funny and would offer very minimal protection in the current setup.

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I was thinking about that and will mock it up.

It's aluminum plate, so it will provide minimal protection anyway :)

Posted: 1/7/2016 9:00:56 PM EDT

[#10]

Posted: 1/9/2016 10:17:24 PM EDT

[#11]

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<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160107_180708_zpstxiq0wno.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160107_180708_zpstxiq0wno.jpg</a>

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That looks a lot better. If you just want it for looks and to shield from the blast of the muzzle aluminum will work fine. If you want real ballistic protection there are a lot of companies that can make you custom AR500 steel panels which will get you lvl 3 rifle protection.

Posted: 1/23/2016 9:18:24 PM EDT

[#12]

you could try a pak 36 style shield.

Posted: 1/24/2016 10:38:40 AM EDT

[#13]

Hmmmmmm

Posted: 2/1/2016 1:49:28 PM EDT

[#14]

wonder if I can flip my wheels around

Posted: 2/3/2016 11:22:23 AM EDT

[#15]

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Quoted:
wonder if I can flip my wheels around

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To give you more room in between the axle so you can make a larger shield?

Posted: 2/3/2016 12:17:55 PM EDT

[#16]

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Quoted:

To give you more room in between the axle so you can make a larger shield?

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Quoted:

Quoted:
wonder if I can flip my wheels around

To give you more room in between the axle so you can make a larger shield?

Yup.

Posted: 2/26/2016 11:05:51 AM EDT

[#17]

HMMM

Looks like this gun solved the same problem.

Posted: 2/28/2016 10:06:21 AM EDT

[#18]

Sight rail mounted.

Posted: 2/28/2016 10:07:31 AM EDT

[#19]

Replaced shattered ball bearings with high density plastic sliders.

Posted: 2/28/2016 10:10:26 AM EDT

[#20]

Serendipity. While sorting through some stuff I got from my dad's after he died, a perfect length D-ring pin. It was already drilled at the perfect length and everything fit awesome.

Posted: 3/17/2016 8:30:25 PM EDT

[#21]

Headed to big sandy. Anyone else going?

Posted: 3/29/2016 12:03:54 PM EDT

[#22]

Great thread, looks good!

Posted: 4/4/2016 4:49:22 PM EDT

[#23]

Great thread. I can hardly wait for Part 4.(that's the I fired it today thread I hope)

Posted: 4/4/2016 6:38:06 PM EDT

[#24]

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Quoted:
Great thread. I can hardly wait for Part 4.(that's the I fired it today thread I hope)

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It's been fired before, but not since I got the axle welded up and a sight rail put on it.

Posted: 4/19/2016 6:04:53 PM EDT

[#25]

Mounted a scope on it, but need taller rings (or scope with smaller objective) to move it back.

Posted: 4/20/2016 1:55:57 PM EDT

[#26]

Dude, you need to put some Blizzacks on those rims... :)

Really nice project. Now I know I need a longer shooting range. GROG

Posted: 4/20/2016 8:33:15 PM EDT

[#27]

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Quoted:
Dude, you need to put some Blizzacks on those rims... :)

Really nice project. Now I know I need a longer shooting range. GROG

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You like my Somali technical wheels?

I plan to sandblast and spray them if I can't get that damn sticker off.

Posted: 5/10/2016 9:57:45 PM EDT

[#28]

Bump to keep out of archives.

Barrel is at shop getting more threads for a nut to keep the barrel from sliding.

Posted: 6/9/2016 10:50:35 PM EDT

[#29]

OST

Posted: 6/9/2016 10:59:23 PM EDT

[#30]

Cool project.

Posted: 6/9/2016 11:25:07 PM EDT

[#31]

Barrel threaded for a nut to keep it from sliding.

Posted: 6/9/2016 11:32:53 PM EDT

[#32]

Quote History

Quoted:
Barrel threaded for a nut to keep it from sliding.

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg</a>

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg</a>

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Is the new nut the only recoil lug for the barrel?

Posted: 6/10/2016 8:51:09 AM EDT

[#33]

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Quoted:

Is the new nut the only recoil lug for the barrel?

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Quoted:

Quoted:
Barrel threaded for a nut to keep it from sliding.

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg</a>

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg</a>

Is the new nut the only recoil lug for the barrel?

Along with the three clamps, it would appear so. Safe enough for a field piece.

Posted: 6/10/2016 10:00:57 AM EDT

[#34]

Quote History

Quoted:

Along with the three clamps, it would appear so. Safe enough for a field piece.

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Quoted:

Quoted:
Barrel threaded for a nut to keep it from sliding.

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg</a>

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg</a>

Is the new nut the only recoil lug for the barrel?

Along with the three clamps, it would appear so. Safe enough for a field piece.

Previously it was just the 3 clamps. I planned to use a pin located in the gas port on the barrel, but then decided to use the nut instead. With just the three clamps, it held for about 50 rds, but then slid ever so slightly. This was probably due to me not torquing the clamps down enough after a change. Anyway, the nut will be more than enough.

Posted: 6/10/2016 10:50:17 AM EDT

[#35]

Quote History

Quoted:

Previously it was just the 3 clamps. I planned to use a pin located in the gas port on the barrel, but then decided to use the nut instead. With just the three clamps, it held for about 50 rds, but then slid ever so slightly. This was probably due to me not torquing the clamps down enough after a change. Anyway, the nut will be more than enough.

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Quote History

Quoted:

Quoted:
Barrel threaded for a nut to keep it from sliding.

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg</a>

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg</a>

Is the new nut the only recoil lug for the barrel?

Along with the three clamps, it would appear so. Safe enough for a field piece.

Previously it was just the 3 clamps. I planned to use a pin located in the gas port on the barrel, but then decided to use the nut instead. With just the three clamps, it held for about 50 rds, but then slid ever so slightly. This was probably due to me not torquing the clamps down enough after a change. Anyway, the nut will be more than enough.

It would likely be a different story with a static gun, but with the way you have things set up it's a total non-issue. Simple, clean, clever solution.

Posted: 6/10/2016 12:51:44 PM EDT

[#36]

Quote History

Quoted:

It would likely be a different story with a static gun, but with the way you have things set up it's a total non-issue. Simple, clean, clever solution.

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Quote History

Quoted:

Quoted:
Barrel threaded for a nut to keep it from sliding.

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142923_zpsjdpbxtpa.jpg</a>

<a href="http://s1054.photobucket.com/user/jestertooo/media/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg.html" target="_blank">http://i1054.photobucket.com/albums/s484/jestertooo/Mobile%20Uploads/IMG_20160514_142929_zpskrm9jko0.jpg</a>

Is the new nut the only recoil lug for the barrel?

Along with the three clamps, it would appear so. Safe enough for a field piece.

Previously it was just the 3 clamps. I planned to use a pin located in the gas port on the barrel, but then decided to use the nut instead. With just the three clamps, it held for about 50 rds, but then slid ever so slightly. This was probably due to me not torquing the clamps down enough after a change. Anyway, the nut will be more than enough.

It would likely be a different story with a static gun, but with the way you have things set up it's a total non-issue. Simple, clean, clever solution.

Static = no recoil system?

Between the recoil system and the muzzle brake, it's fairly soft shooting gun. Whole thing weighs 100lbs or so and jumps up off the ground pretty good ;)

Posted: 6/10/2016 2:54:38 PM EDT

[#37]

Have you shot anything cool with this yet?

A barrel of water?

Thick steel plate?

Posted: 6/11/2016 8:57:57 AM EDT

[#38]

Quote History

Quoted:
Static = no recoil system?

Between the recoil system and the muzzle brake, it's fairly soft shooting gun. Whole thing weighs 100lbs or so and jumps up off the ground pretty good ;)

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Yes, exactly. With the setup you have, a simple nut like that butted against one of the clamps is sufficient to prevent sliding in the clamps themselves. You've got a nice, simple setup.