I've got a fairly new G19 where the barrel has the normal wear at the top edge where it rubs against the top of the slide. While I know this thread would normally get the usual "it's normal wear, don't worry about it" responses, I was wonder how well something like this... Birchwood Casey Touchup Pen: http://sport.birchwoodcasey.com/Fin...roductID=0baf8d95-99a1-4e70-9f2d-02678e02f137 ..would work to touch up the barrel to look factory new in between range time? I'd really like something that makes it look non-obvious that there's been a touch up, or wouldn't bother in the first place. Would something work better? Maybe another Birchwood Casey blueing product?