I have a new R9S, after cleaning it I was re-assembling the gun and was having a little difficulty with the slide moving over the barrel, after a couple of times of fooling with it everything came together, but i noticed some marks on the inside of the slide where the parts had banged together, is this normal or is the metal just so soft,I know this will not hamper any function of the gun, but I am curious,, also I have a set of Blue Carbon fiber grips that were factory seconds because the blue ended with striping across the grips ( my friend had a couple of pairs like this) I would like to turn them into black any idea what I could use??? Tx Dan