hi all, I have a 686 6 inch barrel. The gun is very consistent, however I've had to adjust the rear sight very far left. This is the only pistol I have that I've had to do this to, it's not me. My 629 was dead center from the factory....Upon close inspection there does seem to be a very slight gap between barrel and frame on the left side. None on the right. Should I send it back to the factory or live with it? What will S&W do? Thanks