Abstract: The invention comprises a pair of telescopic sight mount aligning bars. Each bar comprises an elongated rod having a planar circular inner end bounded by a circular peripheral edge. The circular inner ends of the two bars are perpendicular to the longitudinal axis of their respective bars, and the inner ends of the two bars have substantially identical diameters and peripheral edges so that the two inner ends may be closely juxtaposed when used to align, and to check the alignment of, a telescopic sight mount. Consequently, a telescopic sight mount misalignment will be revealed by a misalignment of the peripheral edges relative to one another and also will be revealed by a non-parallelity between the two inner ends.