I have a 6.5 with the mum intact, wish the overall rifle was in the shape of yours. I can't tell from the pic but it looks like they did a poor job of defacing the mum, Usually they have a shallow hacksaw mark or similar. Looks like yours was just hit with a little sandpaper. I'd try to clean that area up more with a bronxe brush and some Kroil. Fun rifles, and good cartridge, I've killed several pigs with mine. KEEP YOUR BRASS!
"Suppose you were an idiot, and suppose you were a member of Congress, but I repeat myself." Mark Twain