The Mark 5HD is up to 20 ounces lighter than other riflescopes in its class giving you an advantage in the field or at the range. Ergonomically designed with more tactile and audible click adjustments larger numbers and a high-speed throw lever the Mark 5HD is built to put accurate fire downrange faster. Features professional grade optical system first focal plane side focus M5C3 Zero Lock adjustments Zero lock dial and Zero Stop.