To save me time, I copied and pasted:
It's a modular, multi-caliber (able to swap to different calibers, including 5.56 NATO, 300 BLK, and 7.62×39) rifle system that sometimes utilizes STANAG magazines common to more than 60 different firearms, but otherwise has no major parts that interface with AR-15s in any way, shape or form.
Here's an article on the rifle