I still don't understand how they are considered "not guilty" of all the stuff they did.
I'm reading that the gun charges were subversient to the conspiracy one, and the conspiracy was tied to intentionally impeding federal workers from performing their duties, all or nothing deal. It may look that a sympathetic jury went nitpicky and technical. It also surfaced that FBI had 15 informants going through the refuge at various points while it was occupied (27 people were charged in several cases in total) so the defence played a counter-conspiracy narrative.