I've noticed that my P90DC is putting "nicks" in the jackets of all of my ammo. FMJ, hollow points. I've polished the ramp, checked the chamber, looked and felt for any type of spur in the lands and grooves, checked my mags. I cannot find what is doing this. I know that it doesn't affect the shootablity of the gun. But, if I sell it at a later date, I don't want someone coming after me telling me that I sold him a crappy gun. Ideas ???