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The Picatinny rail has a similar profile to the Weaver, but the recoil groove width of the Picatinny rail is 0.206 in (5.23 mm) versus 0.180 in (4.57 mm) of the Weaver rail/mount, and by contrast with the Weaver, the spacing of the Picatinny recoil groove centers is consistent, at 0.394 in (10.01 mm).
Unertl Optical Company, Inc. was a manufacturer of telescopic sights in the United States from 1928 until 2008. They are known for their 10× fixed-power scopes that were used on the Marine Corps' M40 rifle and made famous by Marine Corps Scout Sniper Carlos Hathcock during the Vietnam War.
They developed achromatic holographic optics that compensate for any change in the emission wavelength of the laser diode with temperature. [ 3 ] [ 4 ] [ 5 ] The sights are designed to be mounted on small arms via a MIL-STD-1913 Picatinny or Weaver rail , and powered by either AA, N or CR123 size batteries for up to 1,100 hours of runtime.
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 Redfield scope mount removed the rear peep sight that was standard on the M1903A3. The scope used on the M1903A4 was a Weaver Model 330 or 330C, which was a 2.75x telescopic sight. The receivers were tested by Remington Arms and those that were deemed best, meaning those closest to design specifications were selected to become M1903A4s.
Three Weaver rail mounts are present on the G22: The top handle scope mount (which also has an integrated movable six-setting rear sight) a small mount just below the muzzle intended for a Walther-produced laser sight, and a longer mount under the forearm for bipods, flashlights, etc. [3]