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Vortex Optics is a DBA of Sheltered Wings, Inc., which was incorporated in Wisconsin in 1989. Sheltered Wings, Inc. DBA Vortex Optics began in 2002. In 2022 after extensive research, testing and reviews Vortex became an official supplier and contractor to the American Military as the U.S. Army selected Vortex‘s XM-157 fire control system for its Next Generation Squad Weapon program.
Scopes for ring mounts are available in many different sizes. The most common ones are: 1 inch (25.4 mm) 30 mm; 34 mm; Some less common standards are: 3 ⁄ 4 inch (19 mm) 7 ⁄ 8 inch (22 mm) 26 mm – Some older European scopes; 35 mm – Some IOR, Vortex and Leupold models; 36 mm – Some Zeiss and Hensoldt models
The scope ring size (inner diameter) must correspond closely to the outer diameter of the telescopic sight main tube, or else the telescopic sight would either be loosely mounted, or sustain compressive fatigue due to being clamped too tightly. The three most common ring sizes are:
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Ring sizes can be measured physically by a paper, plastic, or metal ring sizer (as a gauge) or by measuring the inner diameter of a ring that already fits. Ring sticks are tools used to measure the inner size of a ring, and are typically made from plastic, delrin , wood, aluminium, or of multiple materials.
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens.
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.