That’s a mighty fancy holster you’ve got there, ma’am.

The crook in this story was charged after cops found a North American Arms .22 caliber pistol (pictured below).
http://www.thesmokinggun.com/documents/crime/prison-pouch-sentencing-573048

You want to talk “high capacity?” A woman in Illinois was charged after they found this stashed where the sun don’t shine.

Stainless steel is a good choice for a finish in a firearm if it is likely to be exposed to a damp corrosive environment.