I currently own a Smith & Wesson Peformance Center Model 627 (8-shot), and have been shooting it for 2 years. Recently, I noticed some wear underneath the top strap of the revolver just in front of the forcing cone. The wear is in the form of blast scratches in a thin line just before the forcing cone. Want to know if this is just normal wear and tear on a revolver, or do I have a cylinder gap problem. Any comments appreciated...