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For civilian and home defense, where it woudl be rare or result in incarceration to engage a threat at 300 yards. I think it is best to zero an AR at 50 yards with the large aperture. If zeroed at 50 yards, then from about 10 yards to 200 yards the rounds should hit withing a 2-3 in vertical box, which should be good enough. If you need to engage anything beyond 200 you could flip to the small aperture which is supposed to be just a hair taller than the small aperture. At very close range (3-7 yards) point shoot or just bring the front post just above the aperture about 1mm. Works for me.