Mark 6 scopes have 34mm main tubes and feature mil-based ZeroLock™ windage and elevation dials that prevent unintentional adjustments in the field. They are available with different styles of ranging reticles located on the front focal plane (FFP), so the subtensions remain true at all magnifications. The 1-6x20mm allows both-eyes-open shooting without magnification, with the ability to zoom up to 6x for longer shots. It’s available with the illuminated TMR (Tactical Milling Reticle), the CMR-W 5.56 reticle calibrated for military M855 ammo at 900 yards, the CMR-W 7.62 reticle calibrated for 175 grain .308 loads out to 1,200 yards. The 3-18x44mm scope is available with the CMR-W 7.62 reticle, the illuminated TMR, or the Horus H58 mil-based reticle. TMR models require a battery, included, and do not have the FFP feature. 1-6x20mm is 10.3" long with 5" mounting space, 3.7" eye relief and weighs 17 oz. 3-18x44mm scopes are 11.9" long, have 5.3" mounting space, 3.8" eye relief and weigh 23.6 oz.
AR-15, Issue:11, Page:097
Big Book Catalog, Issue:69, Page:275
Sinclair, Issue:5B, Page:180
SPECS: Lens Coating - Xtended Twilight Lens System With Diamond Coat 2. Adjustment Markings - Zerolock 0.2Mil per click. Maintube Diameter - 34mm. Special Features - Superior 6:1 zoom optical system, Illuminated Front Focal Plane Reticles, Daylight Visible Illumination, also Compatible with Night Vision Devices, Zerolock Adjustments With Available BDC. Environmental Protection - 2nd Generation Krypton / Argon, Waterproof, Fog Proof. Eyepiece Design - Locking Fast Focus. Actual Magnification - 1-6. Linear Field of View (ft @ 100yd) - 105.8-19.3. Linear Field of View (m @ 100m) - 35.2-6.4. Exit Pupil (mm) - 10.2-3.3. Weight (ounces) - 17.0. Weight (grams) - 482. Length (in) - 10.3. Length (cm) - 26.2. Mounting Space (in) - 5.0. Mounting Space (cm) - 12.7. Objective Aperture (mm) - 20. Eye Relief (in) - 3.7. Eye Relief (mm) - 94.0. Elevation Adjustment Range (MOA) - 130. Windage Adjustment Range (MOA) - 130.