One suggestion that likely most of you already realize.
Be careful where you put the stickers; keep 'em low and use thin ones.
Why do I mention it? You might ask...
I had a guy want to return his mags because they wouldn't fall out when the mag release was pressed.
He had put number stickers half way up the back of 'em and they were the really thick kind.
A quick swipe with the knife and they worked - and the guy was actually disappointed his stickers had to come off.




























