Rifle length barrel without a F marked sight

[freedom]

Who sells one? I traded a flat top for a A2 upper today. Every barrel I see has a F marked FSB. I'd rather not pin one on myself.

 

[becausefu]

You can always trim down the front sight post

 

[Liberty]

I think Model 1 Sales has one available, please keep us up to date. I have an a2 upper in need of a barrel.