This bill establishes new criminal penalties in New Jersey for the sale and possession of machine gun conversion devices, which are defined as any device designed to modify a semiautomatic firearm to enable it to fire multiple rounds with a single trigger pull. The bill amends existing definitions in the state's firearm laws, specifically adding the definition of "machine gun conversion device" and modifying the definition of "machine gun" to include firearms equipped with such devices. The possession of a machine gun remains classified as a second-degree crime, while possessing a machine gun conversion device is categorized as a third-degree crime, with penalties that run consecutively to those for possessing an assault firearm or machine gun.

Additionally, the bill criminalizes the manufacturing, transporting, selling, or disposing of machine gun conversion devices, also categorizing these actions as third-degree crimes. The penalties for these offenses include three to five years in prison and fines up to $15,000. The legislation aims to enhance public safety by tightening regulations on firearms and addressing the risks associated with the proliferation of devices that can convert semiautomatic firearms into fully automatic weapons, reflecting a commitment to comprehensive firearm laws in New Jersey.