I agree with Rreaper. Zero the gun for 100m and get dope for 150-300 (300 is optamistic for a 10.5"). Most guys I know (including myself) use the 100m Zero for their shorties. Just don't forget to aim a little high at cqb distances.
BTW what is everyones take on the 200m zero for M-4 length? I've been using it for several years now. I find it works great for 14.5" uppers.
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