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The Mauser is the worst sight picture of any of the common milsurps. It would be much better with a u-type notch. The K-31 is the best Tangent sight followed by the Mosin and SMLE.
Let's not forget that the K98 ( and all others for that matter), were designed to be used by youth in their prime. Not optically deficient geriatrics out for a weekend shoot.