"Body armor." Any protective covering for the body, or parts thereof, made of any polyaramid fiber or any resin-treated glass fiber cloth or any material or combination of materials made or designed to prevent, resist, deflect or deter the penetration thereof by ammunition, knife, cutting or piercing instrument or any other weapon.
"Instrument of crime." Any of the following:
"Weapon." Anything readily capable of lethal use and possessed under circumstances not manifestly appropriate for lawful uses which it may have. The term includes a firearm which is not loaded or lacks a clip or other component to render it immediately operable, and components which can readily be assembled into a weapon.
18 Pa.C.S. § 907