DEPARTMENT OF THE TREASURY
BUREAU OF ALCOHOL, TOBACCO AND FIREARMS
WASHINGTON, DC 20226
MAR 25 1999 903050:CHB
3311
Dear Mr. :
This refers to your letter in which you asked about possession of
spare M-16 machinegun parts by a person who possesses a registered
M-16 and a semiautomatic AR-15 rifle..
.
.
.
A person who possesses a registered M-16 machinegun and
a semiautomatic AR-15 rifle and
a separate quantity of M-16
machinegun components could be in possession of two machineguns.
..
.
.
We would advise any person who possesses an AR-15 rifle not to
possess M-16 fire control component. If a person possessed only
the M-16 machinegun and spare M-16 fire control components for that
machinegun, the person would possess only one machinegun.
http://www.cs.cmu.edu/afs/cs/user/wbardwel/public/nfalist/atf_letter52.txt