I wanted to report that I just recieved my upper (not disassembled) back from Adco.
They threaded my Bushmaster HB and installed a Phantom flash hider. It looks perfect, and
they did not even scratch my barrel installing it on a barrel with an upper hanging on it!
Also the turn around was very fast, and they paid return shipping.
I had held back before from getting the barrel threaded before due mostly to the turn around time
of other popular shops, but this site convinced me to try Adco.
Kudos to Adco! (bastards are going to cost me alot of money before it's over though