The proposed bill in New Jersey establishes criminal penalties for the sale and possession of machine gun conversion devices, amending the definition of "machine gun" to include firearms equipped with such devices. It introduces a new definition for "machine gun conversion device," which refers to any part designed to modify a semiautomatic firearm to enable it to fire multiple rounds with a single trigger pull. The bill classifies the possession of a machine gun conversion device as a third degree crime, with penalties running consecutively to those for possessing an assault firearm or machine gun, which remains a second degree crime.

Additionally, the bill criminalizes the manufacturing, transporting, shipping, selling, or disposing of machine gun conversion devices, also categorizing these actions as a third degree crime. 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 related devices, while also providing exceptions for law enforcement and military personnel regarding certain weapons and ammunition. The act is set to take effect immediately upon passage.