Question

[Yellowshaker 1]

Guys, I have searched, but could not find the answer to my question. I currently own an AR-15 that I purchased from an FFL. I would like to build my own at some point in the future and I am trying to be clear on the laws here in our great state. I would like to build something for longer range than the one i currently own and my question is about the muzzle device. If you are running a barrel longer than 16 inches, do you still have to have it permanently attached? From what I have read, it seems the only reason to have this done is for barrel length to be in accordance with the law. Again, sorry if this has been covered.

[Blake 50]

Yeap it's been covered, and YES you still have to have it permanently attached in NJ.

[raz-0 1,259]

Federal law requires a 16" minimum barrel length. Nj has an assault weapons ban, and with a detachable mag and pistol grip, you can't also have the threaded barrel. So even over 16", you need a crowned barrel, or something that covers the threads and is permanently attached.

[Anselmo 87]

You can't have a threaded barrel that you can unthread a muzzle device.  If you have a 16+" crown barrel and want to attach a muzzle device with a set screw, that is legal. 

[GRIZ 3,369]

As has been said you can have a plain crowned barrel and no muzzle device whatsoever.