Originally Posted by
Androctonus
Hello everyone. I got the FSB on my Colt 6920 shaved down and put a free float rail over the gas block. The gunsmith didn't shave the FSB down as far as he could. At the least, I can barely stick a 0.030" feeler gauge between the side of the gas block and the rail. There's more clearance on the other sides, as well as top and bottom. Is that going to be enough free float clearance when the M4 profile barrel whips under fire? The gunsmith refuses to shave the gas block any further.
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