So I pulled my SMR butt plate out of its box to begin metal finishing on it and noticed this weird heat discoloration on one end that I've never seen before and I don't know what the significance is. Is this a problem I should contact Kibler about? Is it likely to adversely affect my finishing? If not, if it can just be filed and sanded away, I don't see any need to bother them. I'll just proceed with filing. But won't start until I find out. Thanks!!