Originally Posted by
bb223
Years ago I had a buddy notch out a cheap YHM FF tube for a 16" carbine with the FSB.
It was a range toy so I never abused it or used it for anything tough so I can't comment or durability, the biggest problem that I completely overlooked before starting was how much of a PITA it would be to reinstall the FSB pins. Holes had to be cut in the rail for punch access and I would likely not do it again. Sorry I couldn't answer your durability question but figured it was worth mentioning the FSB pins in-case, like me, you overlooked it.
I want to say someone here did it to a Fortis handguard and I vaguely remember an ALG but that might've been on another site.