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The Ruger Standard Model is a rimfire semi-automatic pistol introduced in 1949 as the first product manufactured by Sturm, Ruger & Co., and was the founding member of a product line of .22 Long Rifle cartridge handguns, including its later iterations: the MK II, MK III, and MK IV.
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 standard model featured a walnut stock and a barrel band similar to the Ruger 10/22 and the M1 Carbine, but using a solid top receiver. [2] The front sight was a gold bead and the rear sight was a folding leaf-type. The receiver was drilled and tapped for scope mounts. The rifle was fed via a 3 round tubular magazine.
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]
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Red dot sights generally fall into two categories, "tube" or "open" designs. "Tube sights" look similar to a standard telescopic sight, with a cylindrical tube containing the optics. Tube sights offer the option of fitted dust covers and the ability to add filters, such as polarizing or haze filters, and glare reducing sunshades. Since a ...
It consisted of 40×40 mm square mounting plates with 25 or 30 mm holes at the center, and four 6 mm bores around the edges. If four 6 mm rods were secured on the corners, a second mounting plate could slide along the rods, and be secured at any point via set screws. By securing individual lenses within each mounting plate, a telescope could be ...
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.