There's probably not a discernible difference between a .071 and a .073 gas port.
Keep in mind that felt recoil is a sum of parts and not just a gas port size. So, barrel length and profile, gas port, BCG efficiency, gas tube interface, buffer system, and overall weight of the rifle.
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I agree to an extent. But, one could at that point argue there's not a discernible difference between .073 and .076, but we know that there's a big difference in felt recoil and gun operating characteristics going from .076 to .071 at the midlength gas port position, or at least that I've been able to notice.
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