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I trying to show some of the historical issues associated with and FSB. You got three items..."The Chart" was the source of the beginning of what is now known as Butt Soreness if your rifle landed on the wrong side of The Chart.
IIRC, the Rock River guys were the biggest crybabies.
1. "F" Height Front Sight Base (FSB), plenty use to use the wrong size
2. Taper Pins at FSB. Some guy where using roll pin instead of the proper taper pins or worse using those stupid clamp-on units.
3. Finish Under FSB, the cheapskates would skip this extra step to pinch pennies and they would end up corroding, sometimes enlarging the gas port.