Article about piston AR

Just came across this article. What do u guys think.
I own 2 piston rifles.
As for the scar and acr, it seems it holds up compared to other brand piston rifles.

http://www.thefirearmblog.com/blog/2015/09/08/ar-endurance-findings-at-a-rental-range/

2 by 2…hands of blue

Duplicate of another thread. That article isn’t about piston rifles, it is about endurance.

https://www.m4carbine.net/showthread.php?173771-AR-endurance-findings-at-a-rental-range-sometimes-in-excess-of-200-000-rounds