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Military Guns and Ammunition

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This is intended for people interested in the subject of military guns and their ammunition, with emphasis on automatic weapons.

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NGSW Phase 2 Consolidation and info   Small Arms <20mm

Started 30/8/19 by gatnerd; 453268 views.
poliorcetes

From: poliorcetes

8/9/21

I realized that Textron / HK rifle is needlessly extended backwards. As there isn't backward extraction, backwards movement only needs to reach the base of the fresh cartridge.

Steyr ACR - Advanced Combar Rifle - Modern Firearms

Just look at Steyr ACR. Before I could see the internals, I wondered (during the 80s and 90s) how the magazine was so close to the buttstock. And here you are.

Recovery spring can also work against recoil and thus it needs a sizeable working lenght. But it could be placed elsewhere and save some lenght to the weapon, even permitting an innovation as novel and groundbreaking as a folding stock

EmericD

From: EmericD

8/9/21

poliorcetes said:

I realized that Textron / HK rifle is needlessly extended backwards.

A lot of bolt travel equals less bolt velocity before hitting the buffer and less "felt recoil".

smg762

From: smg762

8/9/21

The soviet prototype AK used this too...i think it was called the TKB022...

am i rigt in thinking they both use the same rising chamber mechanism..

Also, any thoughts on that 'finned bearing surface' in terms of feasibility?

Seems like a way to get a .22 up to 762 nato energies - without a sabot

poliorcetes

From: poliorcetes

8/9/21

Reviewing last cutout video it seems to be clear. Thanks as always, Emeric

stancrist

From: stancrist

8/9/21

poliorcetes said:

Recovery spring can also work against recoil and thus it needs a sizeable working lenght. But it could be placed elsewhere and save some lenght to the weapon, even permitting an innovation as novel and groundbreaking as a folding stock

Not sure what you mean.

It looks to me like using the Steyr ACR mechanism in a conventional rifle would not allow any reduction in weapon length.

And because of the downward ejection, I see no way to significantly reduce the overall length of the bullpup configuration.

smg762

From: smg762

8/9/21

If one applied the 85-100k pressures to , say, a .220 swift, what would the result be....could it reach NGSW energies?

EmericD

From: EmericD

8/9/21

smg762 said:

If one applied the 85-100k pressures to , say, a .220 swift, what would the result be....could it reach NGSW energies?

Channeling 3600 J of KE in a .22" barrel would be interesting, for sure (75 gr VLD at >1200 m/s, seems it could be done at 90 kpsi in a 28" barrel, at least for one shot, maybe two).

DavidPawley

From: DavidPawley

8/9/21

And as we can see, the bolt carrier only travels far enough rearward for the rammer to align with the base of the next cartridge.

roguetechie

From: roguetechie

8/9/21

The tkb-022pm wasn't an AK prototype and no it's not a rising chamber Design.

It uses a falling breechblock and rammer design which is very ingenious.

Max actually has a YouTube video with a very accurate 3d model of it's internal workings.

The gun is pure genius in so many ways though not particularly practical or large scale producible.

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