ATF Can help 

explain federal laws that apply to firearms

determine if a firearm is fully automatic (altered to act as a machine gun)

expedite tracing of firearms

answer most questions related to legality of persons or possession of weapons in
 - accordance to federal firearms laws.

AFT Publications are a great resource:

Federal Firearms Regulations (ATF P 5300.4)
 - Includes specific laws related to weapons possession, illegal weapons, prohibited
 - persons, etc. 

State Laws and Published Ordinances
 - Firearms (ATF P 5300.5) 
 - Includes state requirements pertaining to firearms transactions, possession, illegal
 - weapons, prohibited persons, etc.

Important ATF Phone Numbers

Washington, DC Office (202) 927-7777

National Tracing Center:
 - Non-emergency Request (800) 788-7133
 - Emergency Request (304) 274-4100

Local A TF Phone #  _____________________

Federal Firearms Laws

Title I State Firearms Control Assistance**
 - Title 18, USC*, Chapter 44, Sec 921-929 

Title II Machine guns, Destructive Devices, etc. 
 - Title 26, USC*, Chapter 53, Section 5801 - 5872 

* United State Code 
** Assault weapons ban is found in Section 921, Title 18, United States Code