Looks just like a normal shouldered barrel, much better setup for a quick change, switch barrel rig. Just screw it on, make sure you have the right bolt in and go, no need to headspace it every time like the barrel nut's.
Exactly. I know of no competitive shooters that would ever dream of using barrel nuts. Shouldered barrel swaps - if the barrel contour is right - can be done without taking the gun out of the stock, or without even removing the scope. It could be done literally in under a minute.