| 摘要 |
An apparatus adapted for mounting an auxiliary sighting device (such as a scope or night-vision device) on a firearm includes an anchor member which has a surface that is configured so as to abut a portion of the firearm's exterior surface in load-bearing contact. The anchor member has a longitudinal portion through which a pair of spaced bores extend in a transverse direction. A beam having a length greater than the length of the anchor member has a pair of transverse bores whose centers coincide at least approximately with the centers of the two bores on the anchor member. The diameter of a first one of the beam bores is essentially the same as the diameter of one of the anchor member bores, but the diameter of the second beam bore is significantly different in comparison with the diameter of its associated anchor member bore. A bearing member is sized for a snug fit within those two bores of the anchor member and the beam that are essentially the same size; and the bearing member is adapted to function as a pivot for the beam in order to foster alignment of the beam with respect to the barrel. Set screws or the like are utilized to securely hold the beam in a selected alignment position. Mounting rings or the like are adapted for connecting an auxiliary sighting device to the beam, so that the line of sight of the sighting device may be adjusted with respect to the axis of the firearm barrel by pivoting the beam.
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