| 摘要 |
To sight-In a gun—especially a rifle (10)—it has to be held in the same position while it is fired at least twice, the gunsight (14) being adjusted after the first shot so that the gun sight shows the gun aimed at the point of impact of the first shot on the target. Apparatus to hold the gun while sighting-in is performed has a base (16) on which an elogate support frame (40) is mounted. The support frame (40) carries a rear stock clamping arrangement, with which clamping members (21) firmly hold the rear stock (11) of the gun. A gun barrel (13) or front stock (12) locating arrangement (30,31,32,34,37,39), also carried by the support frame, ensures that the front stock (or barrel) of the gun can be repositioned (if it has not been clamped) in the same position after a shot has been fired. Mounting blocks (115, 116) clamped to the base (16) include means to make fine adjustments of the lateral pointing of the gun. Course variation of the vertical pointing of the gun is effected by changing the height above the support frame (40) of a horizontal bar (30) of the front stock locating arrangement. Fine adjustment of the vertical pointing of the gun is effected by movement of pivot arms (24), on which the rear stock clamping members (21) are carried, about a pivot axis (27). Straps to prevent or limit gun movement due to recoil may be included.
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