Assistant U.S. Attorney Allen Chiu said in a statement Tuesday that 40-year-old Joel Cleve Miller, of Twentynine Palms, was found guilty last week of illegally possessing a machine gun.
Miller was not convicted of transporting the weapon from Iraq.
Weapons experts determined the gun was from Iraq, Afghanistan or Pakistan because of its markings.
Miller was initially accused of possessing and selling another machine gun but was acquitted on those charges.
He faces up to 10 years in prison at his sentencing scheduled for Sept. 27.