I last used this upper 3 years ago so memory is foggy, but do remember trying to do too much stuff at the same time (tune the gas, adjust new optic, set up chronograph, etc.) so probably not the best performance that day. Here's a picture of the best group I could muster during load development that day. Black circle is 2" shot at 100 yards.
I primarily use bolt actions so this one has literally been accumulating dust for awhile.