I used Steve Rose at Rose Action Sports (he was recommended on this thread). He charged $90 for cutting, rethreading the choke, rethreading for the bead, and shipping back. The work looks good. I have not shot it since I got it back (maybe next weekend). I shot a couple of boxes through it before getting it cut. It ran like a champ and only messed up when I messed up.
jrmock