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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.