The new M-308 4-16x42 represents Nikon's Precision AR Optic technology for heavier caliber rifles capable of long-range accuracy. Designed for extreme sighting speed and superior long-range accuracy with the popular 308 Win AR platform rifles, the new M-308 4-16x42 features a choice of either the new BDC 800 reticle, or Nikoplex reticle and precise Rapid Action Turrets, each calibrated for the trajectory of the .308 Win/7.62 NATO Match round with 168gr. HPBT bullet. The high magnification range zoom makes it the ideal optic for AR10 platforms as well as for long range bolt action rifle applications. Includes M-308 one-piece mount, with built-in 20 MOA slope.