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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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Exploring The Design Space   Ammunition <20mm

Started 25/7/15 by NathanielF; 167701 views.
QuintusO

From: QuintusO

13/9/20

It has some interesting detail features (the cam system I ripped off for all of my rotary bolt rifles, very good idea), but overall I disagree. It's not a space efficient design.

roguetechie

From: roguetechie

13/9/20

Honestly, my favorite pick for bullpups is still the AUG.

An honest to God super AUG 2.0 could definitely be worth doing but we all know it's never gonna happen.

As far as tavor goes, settling for four moa is a distinctly suboptimal decision no matter how you want to try to spin it in an era when bargain basement AR's that are only partially in spec are genuinely difficult to make shoot that bad...

Like it's just not actually justifiable, so unjustifiable in fact that the country the gun was ostensibly made for doesn't run it in any unit where they're allowed to use anything else.

autogun

From: autogun

14/9/20

roguetechie said:

Honestly, my favorite pick for bullpups is still the AUG.

I am fond of that gun, as well. A couple of years ago or so I visited Steyr and had some discussions with them, as well as a detailed presentation on the AUG. What struck me is that this 40-year-old gun is still highly advanced today. I do think that Steyr missed an opportunity, though: instead of developing yet another 5.56 mm AR-15 descendant, they really should have put the money into a 7.62 x 51 AUG. That way, they could have offered armies the opportunity to adopt both 5.56 mm and 7.62 mm rifles/ARs with matched handling - and had something that could easily be converted to 6.5 mm Creedmoor or whatever. Hindsight is a wonderful thing!

tidusyuki

From: tidusyuki

14/9/20

Thanks for the links. After looking at those patent images for quite sometime unfortunately i still don't really understand the barrel mating procedure nor how the barrel is supposed to be placed tightly inside the upper. The detailed description has so many engineering terms that are quite hard to grasp either. Mind explaining it to me?

Also I'm just really curious about it. How is the barrel block/trunnion manufactured and attached in the extruded upper?
here in the MCX barrel block there's no visible screws nor pin unlike on those SCAR type rifles.





 

Msg 6327.1146 deleted
QuintusO

From: QuintusO

18/9/20

So the most recent versions of 5.56 Supercruise (which is getting renamed soon for confusion reasons) is outperforming 6.8mm GP for raw energy at 1KM.

QuintusO

From: QuintusO

26/9/20

Supercruise continues to do well:


  • Edited 26 September 2020 18:45  by  QuintusO
QuintusO

From: QuintusO

2/1/21

Many projects have come and gone since the last time I posted here.

Figured there might be some interest in the current effort. M4 retrofit for 6.5 Grendel w/ composite case, including new bolt, barrel, barrel extension, carrier, and magazine.

Recently got done with some FEA on the new bolt design, strength vs the standard 6.5 Grendel bolt is improved by 17%. This allows a higher operating pressure of 75,000 PSI within an AR-15 format. That, combined with the Mk3 VKO design (which recently underwent their first real life flight test), gives us a muzzle velocity of 2,770 ft/s from a 14.5" barrel with a 100gr bullet G7 BC 0.284. This approaches the ballistics of the 6.5 Creedmoor, but does so from the existing small frame format. Round weight is comparable to M855.

Additional improvements to the carrier allow for dramatically improved upper receiver life, Cam pin drag is eliminated, and operating margin greatly improved.

I'm just one guy, so chances are high this project goes nowhere, but I know it's the kind of thing that gets attention around here so I figured I'd mention it.

autogun

From: autogun

2/1/21

In new money, that's 6.48 g at 844 m/s, for 2,308 J ME with moderate recoil (but presumably a good suppressor required!).

That would appear to be light enough (in weight and recoil) to replace the 5.56 mm, while having the long-range performance to make 7.62x51 class weapons unnecessary at squad level. Sounds promising for a GPC...

PS how close can you get to that BC with an EPR-construction bullet?

  • Edited 02 January 2021 4:55  by  autogun
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