NJ A3595

Defines "machine gun conversion device" as any device capable of converting a firearm into a machine gun under New Jersey law

Expands the definition of "machine gun" to include frames, receivers, and any parts designed solely for converting a firearm into a machine gun

Makes possession of a machine gun conversion device without an attached firearm a third-degree crime, equivalent to existing penalties for bump stocks and trigger cranks

Sentences for possession of conversion devices must run consecutively to (not merge with) sentences for unlawful possession of assault firearms or machine guns

Adds machine gun conversion devices to the list of items that cannot be manufactured, transported, shipped, sold, or disposed of without proper licensing