I am lucky enough to have just bought a brand new Model 41 Performance Center Pistol. I cleaned it initially and did not notice anything but today I shot 80 CCI standard velocity rounds. All went well with no FTE, etc. When I brought it home I cleaned it again. This time I noticed a ring around the inside of the barrel about 3/4 inch from the breech. It looks like a machining mark where maybe they do something like taper that end of the barrel. However it is significant enough I can feel it with a wooden toothpick. Is this normal for the model 41 Performance Center barrel?