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globe sight
A globe sight is a front sight component used to assist the aiming of a gun/device, usually those intended to launch projectiles, such as firearms, airguns, and crossbows. It is found in particular as a front sight element on rifles.
To obtain a usable sighting line the diopter has to have a complementing rear sight element.
Diopter and globe sighting lines are commonly used in ISSF match rifle shooting events.
==Globe front sight==
The globe front sight consists of a hollow cylinder with a threaded cap, which allows differently shaped interchangeable front sight elements to be used. Most common are posts of varying widths and heights or rings or holes of varying diameter — these can be chosen by the shooter for the best fit to the target being used. Tinted transparent plastic insert elements may also be used, with a hole in the middle; these work the same way as an opaque ring, but provide a less obstructed view of the target. High end target front sight tunnels normally also accept accessories like adjustable aperture and optical systems to ensure optimal sighting conditions for match shooters. Some high end target sight line manufacturers also offer front sights with integrated aperture mechanisms.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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