Thanks for the suggestion about carbon build up In the chambers. I followed your cleaning suggestions and it was carbon, not burn marks or rust. All is OK now! I haven’t had this problem before and assumed the worst case.

The gun was bought Last week and Sunday was the first time I shot it. The gun is not very pretty on the outside, but the rifling and cylinder lock up are great.

My other S&W’s are a model 28 and a .380 Bodyguard