Threaded. When your done abusing yourself with the concussion from a brake your going to want a flash hider.
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent
Personally I got the King Armory brake and could not be more happy with it.
It looks great, works great, and did not take long for King Armory to install.
And since I have no intentions on a suppressor for this rig any time soon it was a no brainer