The Ninth Circuit has determined that a federal conviction for importing, manufacturing, or dealing in firearms without a license is an aggravated felony. The court deferred to the agency’s determination that “illicit trafficking in firearms” means “any unlawful trading or dealing” in firearms.
The full text of Chacon v. Wilkinson can be found here:
https://cdn.ca9.uscourts.gov/datastore/opinions/2021/02/18/18-71515.pdf