Sld1959
Ronin
It's just the bolt which holds the cylinder correctly in place. The little spring loaded piece on the bottom interior of the frame. I have seen many revolvers come from the factory with the start of a drag line especially those with matte finishes like that. If the person on the line and the owner simply cocked the hammer a number of times spinning the cylinder it will add to it each time. I mean really, every new gun owner will at least rotate the cylinder and maybe dry fire a few times just to get a feel of it. I understand it can be stoned to stop this from increasing but it's just cosmetic.If you zoom in on the one in the photo you can see that the "drag line" continues through the little concave indentions that stop the cylinder at each chamber. If whatever is making the drag line is static, which I think it has to be, the line would be broken over those indentions.
Nothing to be concerned about. My wife's 637 had the makings of a drag line when it came in brand new.
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