US Optics are assembled in the US, but they use both American and foreign components.
The TS series is engineered here in the U.S. Quality Assurance inspected in U.S., but sadly made in China. It’s still a sweet little optic. Fairly lightweight, really good glass for the price, solid construction. Diopters are nice and tight, fixed parallax is set for 100yds, These are good to go. I have a TS-8X RBR and I think it’s solid.