check with Kurt at Kurts Kustom Firearms:www.ar15.com/forums/forum.html?id=44
** to convert to post ban, the brake needs to be pinned and welded in place ** (it's the law).
What kind of bbl is it? Goto the "equipment exchange" forum, perhaps someone would trade your pre-ban for a post-ban.
<OR> sell this one and buy a new post-ban upper in the configuration of your choice for about $400 complete.
Let me know what kind of bbl it is, I'm always looking for something.
Welcome to the board Gunny!