Unlawful use of a weapon is a class C Felony in Oregon.   He is going to become a Felon over this incident, and thus lose his right to ever own or possess any type of firearm, much less that Assault Rifle that he had with him.

Here is a photo taken of him during the occupation, holding his Assault Rifle:

https://pbs.twimg.com/media/CZs_cRHWEAE0-4Q.jpg

To be threatening to kill Federal officers with such a gun?   That really is such totally bizarre behavior.

It is truly going to be ironic, though, if it turns out that his crazy fears of being arrested over the Malheur occupation turn out to be unfounded.   He must be suffering from paranoia, to have done something so extreme and irrational as this.