ive got a perm attached mb and i want it off   but i dont want to lose my original ( no mb ) barrel length.    the brake sucks so bad and i hope  i can install a thread on phantom.  has anyone done this?  

Use search. Here's some topics I found for you.

www.ak47.net/forums/topic.html?b=3&f=4&t=260699
www.ar15.com/forums/topic.html?b=3&f=14&t=260488
www.ar15.com/forums/topic.html?b=3&f=4&t=226782(it's down the first page a little)

im sent

It depends on how it is pinned and welded...  If it is a blind pin I have become fond of the split and pry method and I have cut four off my various uppers now and I have a Buddy that I am going to get his off of soon as he lets me at his!

www.quarterbore.net/forums/showthread.php?t=153

If the break is pressed on or uses pins that you can see odds are good the barrel is not threaded underneath the break.  In that case you need to find a machinist that can chuck your barrel up in a lathe and cut new threads into the barrel.  I have an AR-10 barrel of this latter "non-blind pin" type and I was a little less then happy to discover that my old dremel couldn't do this one for me.

Good luck and have fun...  a dremel a few six packs of bear and you will either have the break off there or you will just need to buy a new barrel....  Just kidding... It is easy to do unless it is one of the pressed on types!

Question for Randall_Rausch moved to my project thread...

please see:  www.ar15.com/forums/topic.html?b=3&f=62&t=262752&page=1