Th MI and Troy you are looking at are 1 piece rails so you'll need to remove (or chop) the FSB to install them. If you want to keep the FSB you'll need to get a 2 piece rail like the Centurion C4. They also make a 2 piece C4 that extends under the FSB and looks great. They are really sweet rails, I have the 10" C4 on my BCM middy with lo-pro gas block.
I also just got the 9" Troy Vtac Alpha for another middy and although I haven't installed it yet, I can tell I'm really gonna like it. Very light and compact, and looks killer with great t-marks along the top.
Some of the BCM taper pins in the FSB are very difficult to remove. I had to send mine to Adco, great service from those guys BTW, highly recommend them.
Good luck, whichever way you decide to go.
And yeah...nice build!
Last edited by ZeusEcho; 10-19-2012 at 04:36 AM.