I have an older S&W M&P in 38 special. The barrel has a ring of pitting about an inch down the tube from the forcing cone and accuracy is suffering. I contacted S&W's service center and they would be happy to sell me a new barrel, but they will not work on it since it was made prior to 1958. Can anyone suggest a good smithy to replace/swap out the barrel and have a rough idea what it would cost? Any input would be greatly appreciated. By the way, the revolver was made in 1949 according to S&W.