A term used in the firearm industry by enthusiasts to express their feelings on firearms and ammunition choice. Steel
case ammunition is generally seen as lower quality compared to its
brass brethren. This term is used to describe firearms that cannot reliably use the aforementioned steel cased ammunition and needs
brass cased ammunition to function properly.
Person 1: "My AR-15 doesn't cycle Steel
case ammo right."
Person 2: "Just buy
better ammo"
Person 1: "If it doesn't run steel it doesn't deserve brass. I need something that
will work no matter what I have."