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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.
Among scopes for rail mounts, the 22.5-degree V-shaped Zeiss rail is the most prevalent standard. It was introduced in 1990. After the patent expired in 2008, compatible scopes have been offered from manufacturers such as Blaser, [1] Leica, Minox, Meopta, Nikon, [2] Noblex (formerly Docter [3]), Schmidt & Bender [4] and Steiner. [5]
A Zeiss rail system typically adds height to the scope body, but also gives the possibility for a slimmer scope mount so that the total scope height can become comparable to a traditional ring mount. The added scope body height due to the rail piece on the scope itself contributes about 5.5 mm (0.22 in) to the total height.
It is similar in concept to the earlier commercial Weaver rail mount used to mount telescopic sights, but is taller and has wider slots at regular intervals along the entire length. The MIL-STD-1913 locking slot width is 0.206 in (5.23 mm). The spacing of slot centres is 0.394 in (10.01 mm) and the slot depth is 0.118 in (3.00 mm). [8]
The first ACOG model, known as the TA01, was released in 1987. [3] [4] An example was tested on the Stoner 93 in the early 1990s by the Royal Thai Armed Forces. [5]In 1995, United States Special Operations Command selected the 4×32 TA01 as the official scope for the M4 carbine and purchased 12,000 units from Trijicon. [6]
The generic trademark or common name for mounting putty varies by region. It is known as "Patafix" in France, Italy, Portugal, Austria and Turkey, kennaratyggjó in Iceland and lærertyggis in Norway (both meaning "teacher's chewing gum"), häftmassa ("attachment paste") or kludd in Sweden, and wondergom in South Africa (an Afrikaans word ...