Working formerly for Loomis the "state" has set up what firearms can be carried. 357/38 spl loaded "ONLY WITH 38 spl"
Semi-auto 9 mm. State law
Private security guards would have to comply with state law regarding what type/caliber they carry. The state is the one issuing the class "D" and class "G" license for armed security guards.
NRA Life Member, NRA Range Safety Officer, IDPA Safety Officer
As you are, I once was, As I am, You will be.