Sightron products are not made in the USA.
Optics manufacturing went world-wide long ago, just like any other sort of manufacturing, from cars to televisions. Every company buys at least some components from another specialized company, whether screws or lenses.
I don't know of a single optics company that makes everything under one roof. Some companies may grind and coat their own lenses, but they don't make the glass itself.
A perfect example is the Zeiss Conquest rifle scopes. The only parts actually made by Zeiss in Germany are the erector tube and its lenses. The other lenses and main tube are made in the Czech Republic, and the major parts are assembled in the the U.S. Some of the screws may be made in China, along with the raw glass, since China has had a Schott glass plant for almost a decade.
Whether or not a company actually makes anything is irrelevant. What matters is the engineering and quality control.
Vortex is an American company that grew out of a parent company that sold optics from around the world. They don't "make" anything, but they tell optics manufacturers what they want, and then have those specific products made by those manufacturers. Vortex also tests and guarantees those products, and since the company has long been involved in selling top-quality stuff, they know what they're doing.
