Porter-Cable NS100 Air Stapler

It took me a while, but I think I have this sorted out. I was never comfortable with the NSS150 identification I had previously assigned to this tool, but at the time I initially searched, nothing else seemed right, either. I had looked at the NS100A but dismissed it, however a recent exploration (prompted by my own search for a Senco SLS20) finally brought clarity to the matter. Porter-Cable made an NS100 before the NS100A. They are quite different, particularly in the rear support bar. I'm almost positive Norm was using an NS100.