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A rail system mounted on top of a SIG SG 550 A dovetail rail on a rifle receiver for mounting a sight. 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 any standardized attachment system for mounting firearm accessories via bar-like straight brackets (i.e. "rails ...
Right: Acro rail on a Picatinny riser. Approximate Acro rail measurements. Many reflex sights (e.g. red dot sights) and holographic sights have proprietary mounts. [23] Aimpoint Acro rail: A dovetail rail for attaching a sight via a clamping mechanism, and with a 4 mm [24] wide straight recoil lug groove. The dovetail is approximately 16.5 mm ...
The 1913 rail (MIL-STD-1913 rail) is an American rail integration system designed by Richard Swan [1] that provides a mounting platform for firearm accessories. It forms part of the NATO standard STANAG 2324 rail. It was originally used for mounting of telescopic sights atop the receivers of larger caliber rifles.
NATO Accessory Rail (STANAG 4694) The NATO Accessory Rail (NAR), defined by NATO Standardization Agreement (STANAG) 4694, is a rail interface system standard for mounting accessory equipment such as telescopic sights, tactical lights, laser aiming modules, night vision devices, reflex sights, foregrips, bipods and bayonets to small arms such as rifles and pistols.
The mount is found on the left side of the rifle receiver, with machined cutouts for reduced weight and ease of installation; an example is the PSO-1 optical sight. Similar rails can also be found on rifles such as the Dragunov sniper rifle (SVD), the PSL rifle, the PKM as well as some AK series assault rifles from 1954 onwards. Since 1992 the ...
The best known rail interface system is the standardized MIL-STD-1913 Picatinny rail or "Pic rail", also known as the STANAG 2324 rail after its adoption by NATO forces on 3 February 1995. It is named after the Picatinny Arsenal in New Jersey , where it was originally designed, tested and proposed for military adoption over other rail standards ...
Many rail-grabber-mounted accessories can be used on either type of rail, and accessories designed for a Weaver system will always (SWP) fit Picatinny rails – although not vice versa because the Picatinny locking slot width is 0.206 in (5.232 mm) vs the .180 width of the Weaver, and the spacing of slot centers is 0.394 in (10.008 mm). [5]
For example on an AR-type rifle, the mil-spec distance from center of bore to top of rail is 1.211 inches, or approximately 31 mm (1.2 in). The mount height itself, that is the distance from the top of rail to center of scope, varies, but typically lies around 36–38 mm (1.4–1.5 in) (higher and lower mounts are also readily available).