I think you're right JWP. In 1985 the M9 was chosen as a service pistol only with no consideration for CC. It found its way into a lot of police holsters but then fell out of favor as guns without slide mounted safeties came along that were lighter and more compact.
The 320 can be hand in a compact (Glock 19-ish) size; MUCH better suited to CC than an M9.
