Picatinny rail — a rail mounting system, a bracket used on various types of small arms to ensure the unification of sight mounts (optical, collimator) and other accessories, including tactical lights, laser designators, bipods, etc.

     Weaver rail — rail interface system, bracket for attaching additional weapon accessories and accessories to hand-held small arms. Thanks to the weaver rail, you can attach an optical or collimator sight to the weapon, tactical flashlight, laser designator, grenade launcher Also, the weaver Rail is often installed on the sights themselves, which allows you to attach additional devices to them: infra-red lights, range finders and other accessories. The Weaver bar can be installed on pistols, rifles, shotguns, and even sports crossbows. The bar is often performed as a fixed part of the weapon.

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