No worries. That's the great thing about the interwebz - lots of people with answers. I got to play around with an unloaded 17 and 19. I like that the safety is ambi-friendly, though fumbling around in the dark for a magazine release on the "wrong side" was less thrilling.
I'm not leaving SDF until 4 PM so a 10 AM opening time ought to allow me an hour or two of practice time before I depart.
Brains are good. As an Alzheimer's researcher, I can never have too many of them. I figure if zombies ever attack, we could strike up some sort of trade agreement.