Good video,
Shot both and own an mws and scar. I think that if you are looking for the best 16 inch, gas gun on the market, I think KAC their CC/PC can claim that spot.
They are incredibly refined and shooting them verify this.
With that being said I have little interest in a 16 inch 308. Its too long to suppress and be practical. Their special variant (6.5/308 SBR) uppers are prohibitively expensive.
The mws just works better in the end for me as the overgassing issue was able to be addressed by a heavier buffer, the weight is a non factor with a lightweight barrel and mloc chassis. They can be configured to be very comparable to a Scar.
The mws allows me to set up the rifle to do exactly what I want it to do.
I can suppress a 13.5 and 30 seconds later I can have a legit 1200 yard performer.
For the premium that it would require to do that with a Kac, that IMO could be used on some pretty high end glass or NV.