Indiana Code Title 35. Criminal Law and Procedure § 35-47.5-2-4

(1) an explosive, incendiary, or overpressure device that is configured as a:

(2) a type of weapon that may be readily converted to expel a projectile by the action of an explosive or other propellant through a barrel that has a bore diameter of more than one-half ( 1/2 ) inch;  or

(3) a combination of parts designed or intended for use in the conversion of a device into a destructive device.

(1) A pistol, rifle, shotgun, or weapon suitable for sporting or personal safety purposes or ammunition.

(2) A device that is neither designed nor redesigned for use as a weapon.

(3) A device that, although originally designed for use as a weapon, is redesigned for use as a signaling, pyrotechnic, line throwing, safety, or similar device.

(4) A surplus military ordnance sold, loaned, or given by authority of the appropriate official of the United States Department of Defense.