Got my Quiet Bore .22 in today, and I must say I'm impressed with the look and feel.
Only issue I have is there isn't any chamfer or under cut on the direct thread mount and the 1/2x28 threaded adapter on my SW Compact has no relief cut at the shoulder. The suppressor doesn't thread all the way to the shoulder. It only threads up to the space between the last thread and the shoulder.
So, I guess I can either stack like 4 shims (not really wanting to stack that many) or maybe pick up a jam nut with a chamfer cut? Maybe a thick washer?