Rail integration system
Type of system for attaching accessories and devices to firearms / From Wikipedia, the free encyclopedia
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A rail integration system (RIS; also called a rail accessory system (RAS), rail interface system, rail system, mount, base, gun rail, or simply a rail[1]) is a generic term for a standardized system for attaching accessories to firearms. Rail systems are straight mounting brackets (usually made of strips of metal or polymer) on the gun's receiver, handguard, or fore-end stock to allow sliding or variable-position attachments. An advantage of the multiple rail slots is the moveable positions to adjust for optimal placement of each item for a user's preferences, along with the ability to switch different items at different placements due to varying eye reliefs on gun sights.
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Firearm accessories commonly compatible with or intended for rail systems include tactical lights, laser sights, vertical forward grips, telescopic sights, holographic sights, reflex sights, backup iron sights, bipods/tripods, slings, and bayonets.
The common types of rail systems for firearms are the dovetail rail[2][3] (including the Soviet variant known as the Warsaw Pact rail), the Weaver rail,[4] the Picatinny rail, the SOPMOD, and the M-LOK.[5][6][7][8] There are also various non-military designs used in shooting sports to attach slings and bipods such as the UIT rail, Zeiss rail, and Freeland rail.