JHB51 hit the nail on the head. You're on the right track by sending the revolver back to Smith. The problems could be caused by a number of things from the hand, the cylinder stop, the rebound spring or just crud. You seem to indicate that it's a new revolver so you can probably forget the crud. Anyway, I know that Smith will take care of the problem and if they replace any parts, they normally send the bad parts back with the revolver. That will give you an indication of what the problem(s) were.