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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
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.
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PS 45-71 - Young Men's clothing; PS 54-72 - Girls Clothing; ASTM D5585-95 (2001) ASTM D6829-02 (2008) ASTM D5585-11 (2011) (withdrawn, 2020) ASTM D6240-98; ASTM D6960-04 – Women's Plus sizes (2004) There is no mandatory clothing size or labeling standard in the US, though a series of voluntary standards have been in place since the 1930s.
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:
I've seen other pages that list it as ring_diameter = 11.54 + 0.83 * ring size, which more closely agrees with the size 0 number. On the other hand, a linear regression of this chart results in 11.634 + .8136 x ring_size. It's all over the place, and the charts don't even match from store to store.