| 摘要 |
A pivot mount base is assembled to or removed from the sight mounting rail of a firearm by a lever actuated cam energized rail clamping mechanism. The pivot mount base supports and provides for rotational and linear movement of a pivot shaft. A pivot shaft locator pin extending transversely through the pivot shaft is adapted to be selectively received in position controlling relation by pairs of aligned shaft location receptacles defined by the pivot mount base. A sight support device is fixed to the pivot shaft and serves to retain a firearm sighting device. The sight support device and sighting device are moveable between an operative position where the sighting device can be used to sight the firearm on a target and an inoperative position where the sighting device is positioned laterally offset from its operative position. The sight support device is pivotally mounted by the pivot shaft and is spring energized to secure the sighting device against inadvertent movement and noise at its operative and inoperative positions.
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