The proposed bill amends New Jersey's criminal code to enhance regulations surrounding firearms, specifically focusing on machine guns and related devices. It expands the definition of "machine gun" to include not only the firearm itself but also the frame or receiver, parts designed for conversion, and any combination of parts that can be assembled into a machine gun. The bill introduces a new definition for "machine gun conversion device," categorizing the possession or sale of such devices as a third-degree crime, with penalties including imprisonment and fines. Additionally, the unlawful possession of a machine gun remains classified as a second-degree crime, maintaining the same penalties as before.

Furthermore, the bill addresses the possession and manufacture of certain types of ammunition and firearms, establishing that individuals, except for law enforcement officers or licensed collectors, who knowingly possess hollow nose or dum-dum bullets or armor-piercing ammunition are guilty of a fourth-degree crime. It also includes provisions regarding bump stocks and trigger cranks, making their possession a third-degree crime without a corresponding firearm. The bill prohibits the use of three-dimensional printers for manufacturing firearms or components without proper registration, imposing severe penalties for violations. Overall, the legislation aims to enhance public safety by tightening regulations on potentially dangerous firearms and ammunition.