Nikon P-Tactical 3-9x40mm Rifle Scope, Matte Black, MK1-MRAD Reticle - 16531.p Nikon?s P-TACTICAL riflescopes provide the features you need to maximize your shooting experience?regardless of the platform you mount it on. Fully multi-coated optical systems housed in rugged, one-inch, aircraft-grade aluminum main tubes brighten even the most dismal environments and unforgiving conditions. The versatile 3x zoom ratio provides the field of view at the low end and the detail at the high end to satisfy most shooting demands. Exposed turrets engraved for maximum readability offer smooth, repeatable adjustments. Smooth-turn aluminum ring with rubberized eye guard allows crisp reticle focus and quick target acquisition. Spring-loaded windage and elevation knobs can be reset to ?zero? after sighting-in for easy reference when making field adjustments. Windage and elevation turrets are clearly marked for quick adjustments. O-ring sealed to prevent moisture from entering body and nitrogen purged for total reliability against thermal shock. Shockproof construction shrugs off hard recoil and rugged use.