The Swedish military has decided to opt for a 5.56x45 SBR as its next-generation PDW.

Finnish and Swedish Defence Forces to Acquire Joint Range Of Firearms From Sako

From the FWIW department.  A brief cameo appearance of the KAC PDW @ 1:27-1:29 in the video below.

YouTube

Peter Zeihan ""China: From Superpower to Geographic Concept in Just a Decade?"

Peter Zeihan ""China: From Superpower to Geographic Concept in Just a Decade?"!None Of These News, Images, Music & Video Clips Were Created...

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Zeihan again drinking to much cool aid

could you have a round which is interchangable with 9mm but far higher pressure. Lets say, 600ft lbs from a pistol.

with an 85grain tungsten spitzer

"reports" that we all know are BS. The 30 carbine had more vel and energy than the 45 so any bullet found in clothing likely went through part of someone else or was a ricochet.

It would not be my choice to use a 30 c but, use what you have.

Glock Sidearm/pdw works in standard holster.

https://www.fab-defense.co.il/en/category-buttstocks/id-2459/quick-deployment-folding-glock-stock.html

Yikes!  IMO, that has way too much stuff hanging behind the holster.

If I want to holster carry a stocked Glock, I'd rather have something more like this:

Or this:

Any would work and give better accuracy and ROF than a pistol and not weigh near as much as a MP7 or AK74 strapped to my thigh.  I tested one at SHOT several years ago, the "stuff" wasn't noticeable to me and headshots at 50yds was easy.  The LOP on the Flux seems very short.

I doubt any pistol, sub gun etc will be able to defeat LIV armor, better just aim for unarmored parts.

 One of the guys that worked for me in Colo was a handgun instructor for the police, Swat and sheriffs dept. First off he shot my FN 57 pistol and loved it when shooting bowling pins at 100yds off hand but he said they train the officers to use their pistols when trying to shoot through vehicles because a lot of the time a 5.56 will not go through if it hits a window gear or thicker area of a car door.  No way a 5.7x28 will pass through a car being 25 -50% lighter and slower.

Something like the Diamondback DBX57 would be a great size and weight  but the 5.7x28???

Probably not, at least for the energy you want. 9x23 Winchester could perhaps be upgraded, as well as 9x25. The real problem is controllability; the vast majority of people(me included) get maximum efficiency out of a 9x19. Anything more powerful, controllability declines relative to 9x19.

It's the problem in rifles for replacing 5.56/5.45; anything more powerful in a combat setting, the ability to hit more than one target quickly declines with an increase in power.

This is why 30 super carry is such a great round, if it doesn't die out completely which looks scary likely.

Ballistically, and in recoil impulse, it's downright superior to 9x19 in every way that actually matters.

It's a legitimate joy to shoot while putting down performance from 3 inch barrels that 9 can't really replicate.