I was cleaning my MKII yesterday and I noticed a significant chip missing at the base of the feed ramp. I can't figure out when that happened. I have had a few misfeeds lately. A couple of times two cartridges fed and jamed up and a couple of times it failed to eject and fed a new cartridge causing a jam. Maybe one of those times. I suppose when the bolt comes forward it could have slamed a extracted but not ejected fired case into the ramp when it was feeding a new cartridge. The nick is centered in the base of the curve on the ramp. It also makes the begining of the ramp razor sharp where it broke off. What should I do?