| 摘要 |
A two-part mounting ring (58) mounts a rear sight element (100, 114) of an open gun sight on a rear portion of a telescopic gun sight (10). A forward two-part mounting ring (32) mounts a forward open sight element (28) on a forward portion of the telescopic gun sight (10). The upper portion of the rear mounting ring (58) includes a vertical slideway (74). The rear sight element (100, 114) has a slide body (76, 106) located within the slideway (74) which is adjustable up and down along the slideway (74). A sight line carrying element (98, 112) is secured to the slide body (76, 106). The sight line carrying element (90) may be pivotally attached (94) to the slide body (76), for pivotal movement about a horizontal axis (94), between an upright in use position and an inactive position down close against the telescopic gun sight (FIG. 2). The front mounting ring (32) has an upper major portion (34) and a lower minor portion (36). The ring portions (34, 36) are secured together by fastener means (46, 48) which extend between fastener ears (38, 42 and 40, 44) at the ends of the two ring portions (34, 36). The fastener ears (38, 42 and 40, 44) are located within a horizontal zone (FIG. 4) which is substantially tangent to the lower boundary of a telescopic sight (10) and is narrower than the diameter of the telescopic sight (10).
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