Blind pinning will work and can be undone, if you go straight in at the barrel, write down the depth so you know how far to go when you drill out the pin.It's not attached yet, was thinking of blind pinning it....
Do you have a reversible recommendation?
You could also go along the side of the barrel, like the retaining pins for the FSB/GB, just don't drill all the way through the barrel extension. This way you can drill in from the opposite side until you hit the pin, then it can be driven out.
If I remember right the barrel goes out to the end of the FSB/GB and you can drill through the unthreaded part, this way it's only seen if you remove the muzzle device when you do the SBR thing.
As for comparing the two, look at the thread 762 posted, it's his build and there's a couple pics that should give enough detail of the FSB.