gatnerd

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; 744243 views.
EmericD

From: EmericD

16/5/23

gatnerd said:

Now we have a gun thats 13.24lbs loaded, with loaded mags of identical weight/size/capacity to the M14.... To me that should ring alarm bells. 

When the French army put a 1.8 kg day / IR sight on a FAMAS to make a 6.6 kg IW (14.5 lbs), the troop acceptance was low...

gatnerd

From: gatnerd

16/5/23

gatnerd said:

Weight wise, the Marines current M27+VCOG 1-8X VCOG + IR + Suppressor is likely getting up to NGSW weight. I'll have to run those numbers later

Turns out the Marines current M27 is indeed nearly identical to NGSW.

M27: 8lb* (specs of 16” 416 vary from 7.83-8.16lb)

VCOG 1-8 SCO: 2lb

PEQ 16: 0.56lb

NT-4 Suppressor:1.35lb

30rd 5.56 PMAG: 1.1lb

=13.01lb

Both the M27 and NGSW show the downside of variable power optics and suppressors: weight.

I had initially strongly advocated on LPVO scopes for all. But now looking at these ballooning weights, plus the much shorter range fighting we see in Ukraine, I'm more inclined to think LPVO's/Smart Scopes should be for the DMR / Squad leaders, and stick with a 1lb ACOG+RMR for regular riflemen. 

Even moreso as a top mounted RDS allows 'passive aiming' with night vision, which is becoming increasingly important now that enemy forces have NVG ability and can see IR lasers. Early reports in Ukraine has said turning on IR lasers was a death sentence. 

 

graylion

From: graylion

16/5/23

gatnerd said:

Namely, the M14 (and later the Battle Rifle in general) fell out of favor due to the weapon and ammunition being deemed excessively heavy, relatively low capacity vs enemy weapons, and harsh recoiling. And that was when the weapons were ~10.7lbs loaded. 

If people are complaining about a harsh recoil, more mass is a good thing, because physics.

smg762

From: smg762

16/5/23

if you cuold make a durable 762/6.8 gun which weighed only 2.9kg, would the recoil be very harsh?>

graylion

From: graylion

16/5/23

smg762 said:

if you cuold make a durable 762/6.8 gun which weighed only 2.9kg, would the recoil be very harsh?>

https://www.omnicalculator.com/physics/recoil-energy

nincomp

From: nincomp

16/5/23

graylion said:

If people are complaining about a harsh recoil, more mass is a good thing, because physics.

That is a bit simplistic.  There is a difference in total recoil and how it is perceived by the shooter.

I recall that the Beretta-True Velocity RM277 had a more sophisticated recoil reduction system than the SIG.  I think it was along the lines of the system being used in the  XM250, essentially a recoiling barrel/inner-receiver isolated from the main receiver by a damper.  The longer barrel of the bullpup also allowed a less energetic cartridge to be used with less energy left to create rocket thrust.   The SIG XM5 does not have any recoil-reducing features.  I was obvious early on that it would have highest felt recoil.   I don't know if merely adding a recoil pad to the buttstock is considered an option since traditionally the butt of the rifle is expected to be used as a weapon itself.

One of the issues with a competition like used for the NGSW is that the winner is chosen to be used largely "as is".  It is unlikely that only one of the competitors would have ALL of the best ideas.   From an engineering standpoint, it would make a lot of sense to develop another generation of weapons using the best of the ideas from the previous submissions.  For example, True Velocity claims that their polymer case could handle 80,000 psi.  If indeed that is true, it is entirely possible that the wrong case technology was chosen simply because it was submitted with the preferred rifle design.

gatnerd

From: gatnerd

16/5/23

nincomp said:

One of the issues with a competition like used for the NGSW is that the winner is chosen to be used largely "as is".  It is unlikely that only one of the competitors would have ALL of the best ideas.   From an engineering standpoint, it would make a lot of sense to develop another generation of weapons using the best of the ideas from the previous submissions.

Absolutely this.

Really I think what would make the most sense is figuring out the case technology and cartridge, then having a new competition where all the manufacturers are given the cartridge (whether its SIG's 6.8 hybrid, TV's neckless polymer, or perhaps a thin wall stainless steel design ala FN .264) and they each design a weapon system around that common cartridge.

And the rifle and LMG competition should be separate, so Company A might have the best Rifle design and Company B might have the best LMG. 

smg762

From: smg762

17/5/23

could you have a steel case like the FN, but with a SIG style steel base, to allow high pressures too?  or combine the steel base with a polymer case

nincomp

From: nincomp

17/5/23

The True Velocity polymer case already has a steel base.  It would be possible to make a two-part steel case, but that would likely add cost.  It would probably make more sense to just design a one-piece steel case that could handle higher pressures.   

At this point in time, it is unclear whether raising max chamber pressure is the best option.  There are advantages, for example, more work can be done in a shorter distance, meaning shorter barrels for the same velocity, but there is not yet a lot of experience to know the tradeoffs.  Some potential downsides are: more expensive materials, reduced service life of components,  significant weight increase and sensitivity to dirt, sand, snow, etc.

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