The bill introduces stringent regulations and criminal penalties concerning the sale and possession of machine gun conversion devices in New Jersey. It amends the definition of "machine gun" to include firearms equipped with a trigger crank or a machine gun conversion device, and establishes a new definition for "machine gun conversion device" as any part designed to modify a semiautomatic firearm to enable it to fire multiple shots 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 outlines specific penalties for various prohibited weapons and devices, including destructive devices and sawed-off shotguns, while also addressing the manufacturing, transporting, and selling of machine gun conversion devices as a third-degree crime. It clarifies exceptions for law enforcement and military personnel regarding the possession of certain prohibited items and emphasizes compliance with federal regulations for specific personnel. Overall, the legislation aims to enhance public safety by tightening regulations on firearms and related devices, ensuring that violations result in significant legal consequences.