Like Sniper7 advises call the ATF. There are many exceptions concerning transferrs of a "bequest or intestate succeccion".

From the ATF webbsite-

Bureau of Alcohol, Tobacco, Firearms and Explosives
Denver Field Division
1961 Stout Street, Room 674
Denver, Colorado 80294 USA
Voice (303) 844-7450
Fax (303) 844-7535
DenverDiv@atf.gov