Every U.S. Optics Riflescope is engineered to standards we developed over our 28-year history, then hand assembled by our technicians in Montana before undergoing rigorous testing of features by multiple technicians during our quality assurance process. If any U.S. Optics product proves to be deficient in function, quality, workmanship or material, U.S. Optics will repair or replace the product, regardless of transfer of ownership, for life.