The length of the arms, shooting finger, etc are not in anyway useful in determining LOP. Cast (off or on), drop, comb thickness and height and sight center height all affect the correct measure. In a natural stance, typically off-hand, an adjustable stock is adjusted until the shooter's eye is centered in the sights with the head upright and cheek pressed and placed against the comb.
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<br>Every item affecting the LOP has consequences, for example, high scope rings raise the shooter's eye, and shorten the required LOP.
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