The Leupold Mark 5 M5C3 was built with the serious shooter in mind. With input from elite lever military personal and professional shooters, Leupold pushed the engineering limits. It features the Twilight Max HD Light Management System for excellent edge to edge clarity, low light performance and increased contrast. The M5C3 Zerolock adjustment turret is a 3 turn dial with 10 Mils of adjustment per turn with tactile revolution indicators. This scope provides the elite optical performance and rugged reliability that you've been searching for.