Ok, I'm in deep doodoo here, I never carry a Glock. I don't own a Glock! It's either my Savage, S&W, or Kimber.
I would need to ask for a rule clarification.
Can I shoot the guy with interchangable ammo that would have fit my Glock had I owned one???
If not, we need more classifications. :-)
The above scenario is completely unrealistic since it posits, "You are carrying a Glock cal .40..."
Those Glock .40 things are for those southern Republicans who live way, way up north in towns like Richmond, Charleston, Atlanta, Little Rock and Shreveport.
Of course the gun stores around here do sell 'em, but mostly for teaching kids and yankee transplants, in other words, people who don't know much about shootin' real weapons.