OK, thread is useless without pictures, unpacked both of them and arranged them for a photo shoot.
The only differences I see are:
1. rear sight dovetail (as was already mentioned) and the circular indent on the Bersa slide
2. Firestorm wrap around finger groove grips
3. Darker anodized frame of the Firestorm
4. Curious detail, but the trigger stop on the FS is shorter and flatter. Don't know if that was an improvement or change to the Bersa line in general
and finally, as was also previously mentioned...
5. ...combat trigger guard on the Bersa


One seemingly obvious difference that wasn't worth mentioning is the slide markings on the Firestorm are different.
Does anyone know what brand the magazines are with the Firestorm? Are they the dreaded Triple-K? They work just fine, was curious thought I would ask.
Thanks,
Chipsndukes