"Firearm." A pistol or revolver with a barrel length less than eight inches as determined by measuring from the muzzle of the barrel to the face of the closed action or cylinder, whichever is applicable.
"Prohibited ammunition." A bullet or projectile which, if fired from a firearm as defined in 18 Pa.C.S. § 6102 (relating to definitions) under the test procedure of the National Institute of Justice for the Ballistic Resistance of Body Armor published July 2008, is determined to be capable of penetrating bullet-resistant apparel or body armor meeting the requirements of Type IIIA of Standard NIJ Standard-0101.06 as formulated by the United States Department of Justice.
61 Pa.C.S. § 5902