First Focal Plane, or FFP, reticles do not change the area it covers regardless of the power setting. In a FFP scope, as you increase magnification the reticle increases in size. As you decrease magnification the reticle shrinks in size. The reticle therefore subtends the same distance on a target whether the magnification ring is set at 5 power or at 40 power.
Historically, FFP scopes had thick bars that obscured the target at the highest settings,
but March has changed the rules making their FFP reticles usable at magnifications other scope makers can only aspire to.

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