(1) Firearm. Any item classified as a firearm as defined in 18 Pa. C.S. § 6120(b).
(2) Three-dimensional printer. A computer-driven machine capable of producing a three-dimensional object from a digital model.
(3) Additive manufacturing. A manufacturing process in which material is laid down in succession in order to produce the product, including but not limited to three-dimensional printing.
(4) Unfinished frame or receiver. A piece of any material that does not constitute a firearm, but that has been shaped or formed in any way for the purpose of becoming the frame or receiver of a firearm.
(5) Finished frame or receiver. Any frame or receiver that does not require additional milling or other modification to be capable of expelling a projectile when combined with additional components such as a barrel.
(6) Firearm finishing mill. Any computer numerical control mill or other automated device designed to aid the conversion of an unfinished frame or receiver into a finished frame or receiver.
(7) Firearm finishing jig. A jig designed to aid the conversion of an unfinished frame or receiver into a finished frame or receiver.
(8) Firearm finishing device. Any device, such as a firearm finishing mill or jig, which has as its primary purpose to aid the conversion of an unfinished frame or receiver into a finished frame or receiver.
(9) Federal firearms licensee. A person who is licensed by the Bureau of Alcohol, Tobacco, Firearms and Explosives to engage in the business of manufacturing, importing or dealing of firearms.
(10) Regulated Items. Unfinished frames or receivers and firearm finishing devices.