I tried asking this on your website's forms, but it no workie.
Anyway, I'm planning on building a "Mid-length-dissipator" (mid-length gas system with FSB installed closer to the muzzle, like a "Dissy"). Anyway, the problem is most FSB's are meant to fit on a .750" section of barrel, BUT where I want to mount one, it's .740". Could a FSB meant for one of your "Super light Carbines" (.625") be "bored out" to fit a .740". What would you recommend?