Primary Arms Optics, home of the most advanced reticle system in the world: The Advanced Combined Sighting System or ACSS. ACSS Reticles leverage intuitive ranging and holdover tools to render an instant firing solution, so users can accurately engage long-distance targets without any ballistic calculations. These breakthrough reticles are paired with our esteemed Rifle Scopes, Prism Scopes, and Red Dot Sights, which are 100% designed, engineered, and hand-inspected in Houston, Texas. Our products carry a commitment to superior performance.