Per the form 4 instructions
f. Law Enforcement Notification. The transferee must provide a copy of the
Form 4 to the chief law enforcement officer (CLEO) who has jurisdiction
over the area of the transferee’s address shown in item 2a of the Form 4. In
addition, if the transferee is other than an individual, a copy of the Form
5320.23, National Firearms Act (NFA) Responsible Person Question
naire, completed by each responsible person must be provided to their
respective chief law enforcement officer. The chief law enforcement
officer is considered to be the Chief of Police; the Sheriff; the Head of the
State Police, or a State or local district attorney or prosecutor.
g. Photographs and Fingerprints. An individual transferee, except if
licensed as a manufacturer, importer, or dealer under the GCA, must (1)
attach to item 15 of the ATF Form 4, except for the CLEO copy a
2 inch x 2 inch photograph of the frontal view of the transferee taken within
1 year prior to the date of the application and (2) submit two properly
completed FBI Forms FD-258 (Fingerprint Card with blue lines) with the
application. The fingerprints must be clear for accurate classification and
taken by someone properly equipped to take them.