https://www.youtube.com/watch?v=NRuycForGhA

What do you people thing of the so-called "operating group". Seems to be quite easy to manipulate and dismount, but could it be enough sturdy and resistant?

I am not sure if it integrates any kind of quick change barrel system. Althought oscillating chamber can reduce heat accumulation, OTOH supressor use would build heat quite quickly, right?

I am still convinced that textron's CT cartridge is going to be the winner. If it delivers and if AR and R designs are good enough, both two can evolve, but cartridge will not change in decades

My understanding is that design doesn't incorporate a QCB.

Frankly, I wish we'd just skip it all and adopt something low risk, light, that incorporates constant recoil like the KAMG, yesterday.
 

Yeah, no QCB.  But the LSAT experience with CT ammo suggest heating is going to be significantly less than with a conventional gun.  They basically could not make an LSAT cookoff, IIRC.  The chamber doesn't heat up because the plastic case insulates it from the propellant, and the barrel doesn't heat as much because it's not kept in contact with the hot chamber.  Obviously, an open-bolt gun like the NGSW-AR can't cook off anyway, but it shows the degree to which heat build-up is reduced with CT.  Combine that with a barrel using the advanced metals various companies have been proposing, and a QC may not actually be necessary. 

Edit: the comments on that video are stunningly wrong about heating and polymer case telescoped technology.  Ignore them.

We just have frames of the video in order to guess how the system works. It doesn't seem to have extra space for bolt carrier deceleration like in a constant recoil design, but on the other hand it seems to have a manageable recoil for an alledged 4000J cartridge.

An think about it: 4000J for a nice BC bullet. Range is going to be quite increased compared not only with 5.56 SAW but with 7.62 MG. The same for obstacle penetration

You've seen this, yes?  

https://twitter.com/nicholadrummond/status/1194192078491836417?lang=en

It's for the Rifle, not the AR, so there are clearly some differences since the AR is an open-bolt gun, but the basic principle seems the same.  So not a constant recoil mechanism, I'd say.  In fact, rather a short recoil spring. 

The NGSW-AR has a pivoting chamber similar to the earlier LSAT LMG:  https://youtu.be/qL6pPsEJ6GA?t=86

Thank you.  That makes more sense to me.

Pivoting a quarter of counterclockwise turn or oscillating up and down?

A quarter turn CCW for firing, and a quarter turn CW for loading/ejecting.  Just like in the video I linked.

90 deg - you can see this in the original video very clearly when Karl is reassembling the gun from 6:39.

https://youtu.be/NRuycForGhA?t=06m38s