Feature A Precise Bullseye Aiming: VSE-4 MOA Reticle Design with 0.3 MOA Center Dot Optimized for 25m Benchrest Targets A Accurate Adjustment Control: 30mm Tube Dia Expands Elevation Range to 55 MOA with 1/4 MOA Click Value, Focus Min at 10 yds A Enhanced Shooting Visibility: Illuminated Center Dot Ensures Reliable Performance Even Under Strong Sunlight A Reliable Zero Return: Zero Stop Function Allows Effortless Return to a Pre-Set Zero Point for Consistent Accuracy Specification SCFF-57 Sentinel 6-24x50 FFP Magnification: 6-24x Objective Lens Dia: 50 mm Focal Plane: First Focal Plane Eye Relief: 100 mm Lens Coating: Fully Multi-coated Linear Field of View @ 100 yd: 18.3-4.6 ft @ 100 yards Linear Field of View @ 100 m: 6.1-1.5 m @ 100 meters Angular Field of View: 3.5-0.86Adeg Reticle: VSE-3 MOA Tube Dia: 30 mm Side Focus: 10 yards to Infinity Click Value: 1/4 MOA Turret Function: Zero Stop, Turret Lock Elevation Adjustment Range: 55 MOA Windage Adjustment Range: 40 MOA Diopter Compensation: -2 to +2 Illumination Setting: 6 Gears Battery Type: CR2032 Battery Life: N/A Waterproof: IPX4 Fogproof: Nitrogen Filled Shockproof: 750 G Housing Material: 6061-T6 Aluminum Alloy Finish: Matte Black Length: 369 mm / 14.5 in Weight: 775 g / 27.3 oz Items in the Package: User Manual, Plastic Wrench, Cleaning Cloth, Flip-up Caps, Hex Keys, Sunshade, etc. Size Reticle Download Sentinel User Manual Compatible Gun Type For Benchrest Shooting: CZ 457 (.22LR), Tikka T1x / Anschutz / Sako / Howa, Remington 700 / Tikka T3x