Thanks. I just didn’t understand how gun *parts* posed a threat. It seems GEICO customer service could have clarified with him before they cancelled.
Insurers tend to group risks, to some extent. So, while gun parts don't pose a threat, companies that transport gun parts will also be likely (in the eyes of the insurer) to transport guns and ammunition.
And yes, GEICO's customer service could have done a *much* better job of dealing with this guy than they did. While I don't think GEICO's decision to drop coverage necessarily reflects an anti-gun political bent, I do think GEICO's conduct here reflects terrible customer service.