Unfortunately I haven't as time hasn't permitted, other than a standing mag dump @ 40 yards that produced a fist sized group. I know for a fact it shoots better than that.
The bolt stop mod and polishing the bolt/reciever will likely make little to no difference in accuracy.
I'm going to get the trigger lightened and the barrel permanently mounted after the roar and I'm sure that is where big improvement will be found.
I will make time to shoot some groups before and after that.
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