Nikon M-308 Riflescopes 4-16x42 SF -Matte Nikoplex Ultra ClearCoat optical system-Nikon has engineered the entire optical system to provide the shooter with a bright, sharp, incredibly flat sight picture and light transmission up to its theoretical maximum?95-Percent. Precise, 1/4-MOA Hand-turn Tactical-Style, Zero-Reset Turrets-Positive click reticle adjustments get you zeroed in quicker and maintain your setting?even withrepeated recoil. One-piece main body tube-for minimum weight and maximum strength and durability. Included M-223 XR Scope Mount-with built-in 20 MOA slope, the M-223 XR mount enables extreme long range shooting by adding 20 minutes of angle elevation adjustment to the overall system.