I just got this custom 1911 last week. It's my first handgun. I noticed the barrel is 3 different colors. The lenght of the barrel is a matte finish, the top part of the barrel that says S.A. .45 AUTO is stainless, and the lower part has a black finish on it. Marking on the barrel. On the under side of the barrel center to the link there is a T stamped there. On the right side of the barrel there is M S on top and a B on the bottom. On the left side there is an R on the lower link.