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  backbencher

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Posted: December 14 2017 at 11:58am | IP Logged Quote backbencher

Mass-delayed blowback ARs are done all the time for pistol calibers.  Very easy to build as it runs on a standard upper & lower, just uses a blowback bolt & bbl w/o locking lugs.  You should just buy a PSA AR kit and assemble one from scratch, that will answer many of your questions once you build one.
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  KainKelly87

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Posted: December 15 2017 at 11:03pm | IP Logged Quote KainKelly87

backbencher wrote:
Mass-delayed blowback ARs are done all the time for pistol calibers.  Very easy to build as it runs on a standard upper & lower, just uses a blowback bolt & bbl w/o locking lugs.  You should just buy a PSA AR kit and assemble one from scratch, that will answer many of your questions once you build one.

Would shells this long work on a standard upper and lower? I would think the shell would be to long. Also how can I get away with no lock with out having to worry about case rupture?
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  backbencher

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Posted: December 16 2017 at 9:49am | IP Logged Quote backbencher

1 - No.

2 - Lots and lots of mass in the bolt.  Firing one of these monsters from a mass-delayed blowback you'd want a 50 lb bolt as a SWAG.
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  KainKelly87

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Posted: December 16 2017 at 11:22am | IP Logged Quote KainKelly87

So long fat and tungsten? It that point I must ask if a rotating lock would not me cheaper if not easier and safer, not just to make but fire as well. Tungsten in my experience is brittal stuff.

~Kain Kelly
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  backbencher

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Posted: December 16 2017 at 11:42am | IP Logged Quote backbencher

That's why very few firearms mechanisms larger than .45" ACP use mass-delayed blowback.  Over a certain size, a locking mechanism just makes more sense.

The largest mass-delayed blowback action in current use that I know of is the Mk 19 40mm grenade machine gun in US service, and it weighs as much as a Ma Deuce even though it's much more compact.
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  KainKelly87

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Posted: December 16 2017 at 12:37pm | IP Logged Quote KainKelly87

I am way over thinking machining locking lugs, in the receiver. Like the part that takes the lugs from the bolt on the breach, I cant come up with a good answer with out special tooling or a shaper. I circle back to 5 axis, a home brewed metal shaper, and sicker edm. EDM would be PERFECT if I had a 3d printer.
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  backbencher

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Posted: December 16 2017 at 11:36pm | IP Logged Quote backbencher

Small 3-D printers aren't very expensive.  But they don't seem to be able to do much.
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  KainKelly87

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Posted: December 17 2017 at 12:30am | IP Logged Quote KainKelly87

backbencher wrote:
Small 3-D printers aren't very expensive.  But they don't seem to be able to do much.

Odd my edit didnt save, from what I can tell when they broach a extension the lugs are straight not curved. all the curve comes from the lugs. The gas system will be so beefy I almost fear anti-gunners might mistake it for a cannon, but seriously I need to sit an do math to make sure I don't call a pipe bomb a gas system. if that's the case I am going to step back and figure a safe way to go about this. May end up with something looking more FAL then AR, no clue how that would affect sights. If that's the case maybe build a BAR style rifle as a alternative. I am getting ahead of my self on a problem I am not positive I have yet.

On a side note about budget 3D printers, if your going that cheap your in a lot of ways better off building one for about 50-75 more depending on the deal you get. The open source builds tend to have far better tech support then some china clone.
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  hubel585

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Posted: January 11 2018 at 9:47pm | IP Logged Quote hubel585

Our short 585 BB would be easiest to be

used for autos..

Here in picture of the cases, are shown the steps in making

our 416 HSM case, from BMG brass,, Ed




We might have a company that is doing a bolt gun with an action

between BMG size and longer rifle actions used for 375 HE,

375 Lethal, and Cheytacs.. To use for our 416 HSM without

having to do extreme rebating of the rim.


Here is picture of 620   416 hsm cases half done. Done on cnc ,

that slimmed them down, cut new rim and extractor groove.

There are over 500 more at cnc getting done now, plus we have

1000s more bmg cases we make them from, when needed..

This case is public domain and if anyone wants to make

them we can give the steps involved...Ed.

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  hubel585

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Posted: January 11 2018 at 9:49pm | IP Logged Quote hubel585

Here in picture of the cases, are shown the steps in making

our 416 HSM case, from BMG brass,, Ed




We might have a company that is doing a bolt gun with an action

between BMG size and longer rifle actions used for 375 HE,

375 Lethal, and Cheytacs.. To use for our 416 HSM without

having to do extreme rebating of the rim.


Here is picture of 620   416 hsm cases half done. Done on cnc ,

that slimmed them down, cut new rim and extractor groove.

There are over 500 more at cnc getting done now, plus we have

1000s more bmg cases we make them from, when needed..

This case is public domain and if anyone wants to make

them we can give the steps involved...Ed.

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