It could be as little as 1.5x, and an FSB wil not scientifically/technically interfere with the shooter's ability to observe or shoot. The FSB is optically burned through because it's inside the near-focus range of the magnified optic. One will likely note a blur at the bottom of the field of view, but it can be seen through.
It may psychologically interfere if the shooter vapor-locks on the indistinct blur at the 6 o'clock position instead of what's downrange, but that's not the same thing, human error only.
Contractor scum, PM Infantry Weapons
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