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PU telescopic sight from above. The PU scope (ПУ, прицел укороченный, 'Scope short-cut' in comparison to PE/PEM telescopic sight) is a 3.5×21 telescopic sight of Soviet manufacture, widely used since 1940 on the SVT-40 rifle for which it was originally designed and since 1942 on the Mosin–Nagant rifle.
The PE scope (Russian: Винтовочный оптический прицел образца 1931 г. [1] or ПЕ, often called Прицел Емельянова, or Yemelyanov's sight [2] or Прицел Единый or Standard sight) is a family of Soviet telescopic sights, used from 1930s onwards on Mosin-Nagant sniper rifles, as well as SVT and AVS rifles. [2]
Mosin–Nagant Model 1891/30 Mosin–Nagant Model 1891/30 (1933) Soviet Mosin–Nagant model 1891/30 sniper rifle with PU 3.5×21 sight. Model 1891/30 (винтовка образца 1891/30-го года, винтовка Мосина): The most prolific version of the Mosin–Nagant. It was produced for standard issue to all Soviet infantry ...
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]
M26-MASS Stand-alone configuration. Note that the "rear sight" is just the ring used to mount it around a rifle's barrel (as visible in the other pictures.) Caliber: 12 gauge; Operation: Manual Straight pull bolt-action. Capacity: 3 or 5 round detachable box magazine. Ammunition: 2.75 (70mm) and 3 in (76mm) lethal, non-lethal and breaching rounds.
The receiver was open-top, which enabled reloading of the magazine using five-round Mosin–Nagant stripper clips. [9] The sniper variant had an additional locking notch for a see-through scope mount and was equipped with a 3.5×21 PU telescopic sight. [9] The SVT-38 saw its combat debut in the 1939–1940 Winter War with Finland.
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]
The locking bar system allows for even stress to be distributed and prevent canting of the scope mount. Another form of scope canting is caused by the rings themselves. Many Weaver-type mounts, including many Picatinny-type scope rings and even the Redfield Type, have either two or four screws on top of the scope ring that hold the scope in place.