It is amazing that enough material existed on this topic to constitute an entire book. The text reads like a labour of love. Who else would write such a thing?
For science fiction fans, or children of the 50s to the 70s, you can revisit your youth. Some of the ray guns might be recognisable indeed.
The text is nostalgic retrospective on an era with no digital electronics, as we know them now. As far as I can tell, every gun depicted here lacked a microprocessor. Everything was hardwired analog.