Finger-adjustable, knurled windage & elevation adjustment dials in three styles : tall M1 dials have 1/4-MOA click adjustments, while the bullet drop compensation marked M3 dials have 1/2-MOA windage adjustment and 1-MOA elevation adjustment. Audible, tactile "clicks" allow extreme precision adjustments. 30mm main tube is milled from 6061-T6 aircraft aluminum for superior strength. Front focal models increase magnification & reticle increases too, so you can estimate range at all power settings. Superior edge-to-edge sharpness across visual field & outstanding low-light capability. Adjust for parallax for specific ranges from 50 yards to infinity using the turret mounted focus knob, without taking your eyes off target. Adjustment knobs can be zeroed once sighted-in. Black tactical matte finish. Waterproof. Full Lifetime Guarantee.