Primary Arms Optics, home of the most advanced reticles in the market: The Advanced Combined Sighting System or ACSS. These reticles make shooting faster, more accurate and easy to use. We do the math for you the shooter. You will find these reticles available is rifle scopes, prisms scopes and red dots, designed and engineered in Houston TX. We have optics at price points that are competitive and affordable without sacrificing quality.