I won't cut anymore FSB's either. I like the pinned gas block and solid sight but I'm not going to pay $300 for a rail that's cut out for a FSB.

Both of mine are carbine gassed Colts and it wouldn't look right but on a mid, I think I'd try cutting out a section on top and let the FSB pop up through the cut out. I've seen a couple of jobs that turned out well.
https://www.m4carbine.net/showthread.php?128947-Custom-Noveske-14-5s-hacking-up-some-NSRs