More than five or six resin ones were made. Even five or 6 per season I would find hard to believe.
The hero number of 5 might be total over the years. In some scenes you can clearly see one hero ppg upclose and two guards with resin ones with plugged barrels behind so I don't believe they made that many hero ones. I would be interested to hear which seasons used the gold detailing on side and which did not for most resin ones.
Send me more information if you can get it I am curious. I have a few babylon 5 items including season 5 ppg of resin, rubber stunt ppg, resin ppg rifle, pilot episode ppg, ppg holster with resin energy cap, and metal energy cap from crusade.