"Court facility." The courtroom of a court of record; a courtroom of a community court; the courtroom of a magisterial district judge; a courtroom of the Philadelphia Municipal Court; a courtroom of the Pittsburgh Magistrates Court; a courtroom of the Traffic Court of Philadelphia; judge's chambers; witness rooms; jury deliberation rooms; attorney conference rooms; prisoner holding cells; offices of court clerks, the district attorney, the sheriff and probation and parole officers; and any adjoining corridors.
"Dangerous weapon." A bomb, any explosive or incendiary device or material when possessed with intent to use or to provide such material to commit any offense, graded as a misdemeanor of the third degree or higher, grenade, blackjack, sandbag, metal knuckles, dagger, knife (the blade of which is exposed in an automatic way by switch, push-button, spring mechanism or otherwise) or other implement for the infliction of serious bodily injury which serves no common lawful purpose.
"Firearm." Any weapon, including a starter gun, which will or is designed to expel a projectile or projectiles by the action of an explosion, expansion of gas or escape of gas. The term does not include any device designed or used exclusively for the firing of stud cartridges, explosive rivets or similar industrial ammunition.
18 Pa.C.S. § 913