My ARX100 was overgassed with an AAC Ranger 2, but still ran. It was uncomfortable and distracting to shoot. Not just gas in the face, but stinging particles every shot from the ejection port as well.
Accuracy is still terrible with both the original and a spare barrel bought from Brownells. Around 5 MOA with precision ammunition with both barrels. Around 6 with 3 different makes of M193.