I have no idea what tradition you are referring to. Perhaps you could explain, please?
As for suppressors in NJ, they are prohibited.
2C:39-3. Prohibited Weapons and Devices.
c. Silencers. Any person who knowingly has in his possession any firearm silencer is guilty of a crime of the fourth degree.
The definition of silencer is:
g. "Firearm silencer" means any instrument, attachment, weapon or appliance for causing the firing of any gun, revolver, pistol or other firearm to be silent, or intended to lessen or muffle the noise of the firing of any gun, revolver, pistol or other firearm.