We have a PIX 515E R-BUN and I was trying to verify what we had and the number of available ports. It wouldn't recognize more than 3 ports. When I did a show version it said I could have a maximum of 3 ports. I eventually found someone who was able to tell me that this was because it was a restricted bundle and that I had to purchase the upgrade in order to get a maximum of 6 ports. Point being that the 515E didn't specify whether it was the R or UR. The details in the sho version do however point in the right direction if you know how to interpret them.
