I like Connecticut Precision Chambering (CPC)

www.ct-precision.com

I've had Randy do the full tune on 3 10/22s and recommend that anyone doing their first 10/22 upgrade just send their barreled action to him instead of changing a bit here and bit there until you've spent as much, or more, for parts than you would have paid Randy for his holistic turn up where the parts work together in harmony to produce the best accuracy.