A big thanks to Ed for correcting my mistake, I had misread the logo. What I thought was called the NRX is in fact the ARX-160 as you can see in the blown up logo below. I had assumed the “NRX” was the M4 equivalent of the ARX-160.
I have update the blog post. Ed has more info about this rifle/carbine at Tell Me Why.
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I had this rifle in my hands at the Eurosatory 2008 – the ergonomics seemed to be superior to FN’s SCAR (which was about 20m away IIRC). I didn’t test it in some shooting stances, though.
The quick change barrel feature is quite interesting, and really quick. It might offer some auto rifle potential with a bipod, and it offers carbine and rifle in one.
It might also be interesting for a reduction of the thermal signature (if a proper container for the hot barrel and a replacement barrel are issued) – hot barrels are very compromising in NVG/thermals.
I cannot remember any design flaw based on my superficial inspection.