Not available for US customers. If you place an order containing any Holosun items to be shipped to the US, it will be cancelled and a 5% cancellation fee applied. The HS403R is a small compact micro red dot optic that features Holosun’s new rheostat dial to adjust brightness settings. This new intensity control brings you everything you love about a Holosun, only faster! Employing Holosun’s ultra-efficient LED technology, The 403R can achieve a “constant on” battery life of up to 5 years. FEATURES & TECHNOLOGY New rotary control for faster operation and visual brightness indicator Advanced technology LED allows up to 100,000 hours of operation on one CR2032 battery 2 MOA on dot size Unlimited field of view Parallax-free with unlimited eye relief Durable and reliable construction Low mount and 1/3 Co-witness mount included Limited lifetime warranty SPECIFICATIONS MANUAL - English MANUAL - French