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