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That sight has a 40 tpi pitch on its adjustment screws. 4 clicks or 1/3rd turn moves the aperture .0083333..." and with a 30 inch sight radius, that's exactly 1 inch at 100 yards. This has been the standard in the USA made aperture rear sightsfor decades.
Competitive shooters often use .030 to .040 inch aperture sizes.
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