There isn't a charge specifically for a flash hider... as they are perfectly legal for non-semi-auto firearms. It is an "assault weapon" charge... http://www.nj.com/news/index.ssf/2014/04/assault_weapon_newark_airport_arrest.html http://www.nj.com/middlesex/index.ssf/2015/09/sheriffs_officer_arrested_for_assault_had_illegal.html https://patch.com/new-jersey/newarknj/newark-man-with-assault-rifle-arrested http://www.pressofatlanticcity.com/news/galloway-police-nab-a-c-man-with-assault-rifle-heroin/article_77dd3f31-8ab2-5012-ac23-b378c82b038a.html Anytime you see a charge for an "assault weapon," it is a semi-auto rifle that takes a detachable magazine with more that one of five features; pistol grip, bayonet lug, flash hider/threads, collapsible stock, or grenade launcher. A muzzle brake isn't a flash hider... a flash hider is a flash hider. Add in a pistol grip... assault weapon. True, there are no weapons checkpoints. But how do all these people with out of state carry permits get arrested? A simple car stop, and either something is seen or said... and they are in jail. Go to a range, I'm sure the RO would say get out of here, being it is questionable... if he doesn't call the police to decide themselves. Gun ranges shouldn't be expected to look the other way. In regards to officers not knowing the law... so, you'd give something questionable, and expect them not to arrest/seize the firearm? That is how case law is created, and if it is found to be a pistol grip, you go to jail and not allowed to own firearms (convicted felon). You want to call me spineless? Ok... I'll try to remember that when I'm up in Maine and putting the paperwork through for a SBR/suppressor. But I will not suggest someone to do something questionable, possibly opening them up to being arrested and facing up to 10 years. Act as tough as you want, but until someone in the NJSP or NJAG office say it isn't a pistol grip, or legislation is changed, you are doing a disservice to all NJ gun owners. One more "dangerous assault weapon" being pulled off the streets is not needed prior to an election. There are ways to fight NJ's laws... but people being arrested for stupid stuff like that is not the best way of going through it.