Low-Pro Gas Block Shaving

from my searching it looks like my plan is gtg but just wanted to be certain…

my new LaRue 12" FF rail landed today and damn if the gas block on my Anvil Arms barrel is just a bit too big to fit. funny because even before i looked into shaving it down i was ready to break out the dremel…

from the look of some of the shave-jobs of FSB’s here it seems i can take the block down quite far. really my question is about how much space should there be between the block and the inside of the rail? just enough to not be touching?
1/4"?

I like there to be at least 1/8" clearance or more around all edges were it’s going to be close to the rail. Sometimes this even requires shortening the taper pins when using a shaved FSB and a tight rail like a DD Lite Rail or equiv.