https://www.newsnationnow.com/crime/gun-malfunction-las-vegas-gym-shooting/
Olympic Arms PCR-223 was the gun used by the gunman
Olympic Arms went out of business in 2017 and fully shutdown in 2020. Just a gander at the online forums are saying their AR models had quality control problems. Not sure if true or not but interesting the gunman chose a poor quality firearm OR was given this weapon by his FBI handlers.