A bill to amend the Internal Revenue Code of 1986 to regulate certain 50 caliber sniper weapons in the same manner as machine guns and other firearms, and for other purposes.

Anti-Terrorism Military Sniper Weapon Reclassification Act of 2003 - Amends Chapter 53 (Machine Guns, Destructive Devices, and Certain Other Firearms) of the Internal Revenue Code to include in the definition of the term "firearm" a 50 caliber sniper weapon.