orange in color. Bar / dot or express sight Similar to the Straight Eight type, this type of sight is traditional on express rifles and is also found on some handguns. The open, V-shaped rear allows for faster acquisition and wider field of view, though less accurate for longer range precision type shooting. The dot on the front sight is aligned or set directly above the vertical bar on the rear sight, commonly referred to as "dotting the 'I'". Gold bead Preferred by many competitors in IPSC and IDPA shooting. Night sights On tactical firearms, the contrast enhancements can consist of small vials containing tritium gas whose radioactive decay causes a fluorescent material to glow. Self-luminous tritium sights provide vital visibility in extremely low light situations where normal sights would be degraded or even useless. The tritium glow is not noticeable in bright conditions such as during daylight however. As a result, some manufacturers have started to integrate fiber optic sights with tritium vials to provide bright, high-contrast firearms sights in both bright and dim conditions. Fiber optic A growing trend, started on air rifles and muzzleloaders, is the use of short pieces of optical fiber for the dots, made in such a way that ambient light falling on the length of the fiber is concentrated at the tip, making the dots slightly brighter than the surroundings. This method is most commonly used in front sights, but many makers offer sights that use fiber optics on front and rear sights. Fiber optic sights can now be found on handguns, rifles, and shotguns, both as aftermarket accessories and a growing number of factory guns. See also Laser sight List of telescope parts and construction Reflex sight Telescopic sight Notes References External links Additional BRNO target sight images: 1 Additional BRNO target sight images: 2 Additional BRNO target sight images: 3 Firearm components Firearm sights Artillery components