I used one of the finish touch-up pens by Birchwood Casey... the Super Black... flat black... to mark some magazines. Keep it simple and repeatedly mark a 9, 4, or 45, as you like. It wears more much more durably than a Sharpie. The regular gun blue version probably isn't as good on stainless steel.
Wynn
USAF Retired '88, NRA Life Member. Wife USAF Retired '96
Avatar: Wynn re-enlists his wife Desiree, circa 1988 Loring AFB, ME. 42nd BMW, Heavy (SAC) B-52G's
Frédéric Bastiat’s essay, The Law: http://mises.org/books/thelaw.pdf
Thomas Jefferson said
“A government big enough to give you everything you want, is strong enough to take everything you have.”
and
"Peace is that brief glorious moment in history when everybody stands around reloading".