For a 400 yds and in LPV, *I* still prefer my second focal plane, 16.9 ounce, K16i, with it's generous eye box and it's huge field of view. If I would need past 400 yds capability much, *I* would choose the 4.6 oz heavier, 21.5 oz Vortex Gen 3 Razor 1-10X, LPV. *I* would probably also put it on a 16 inch barreled rifle.
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