The Burris Fullfield 3-12x56mm (Model BO201542) is a premium low-light riflescope engineered to maximize light transmission for precise target acquisition during early dawn, deep dusk, or heavy overcast hunting conditions. Designed around a massive 56mm objective lens, this optical system features an illuminated 4A-I (3P#4) Second Focal Plane (SFP) reticle powered by a single CR2032 3V battery. This configuration provides a highly visible red aiming point against dark targets and dense timber. Additionally, it integrates the Burris Knob Synergy system, which utilizes standard capped turrets that can be upgraded with custom ballistic knobs to suit your specific caliber and load.

Key Features

• Massive 56mm Objective Lens: Maximizes light gathering to deliver bright, high-contrast images in low-light environments.
• Illuminated 4A-I Reticle: Located in the second focal plane, featuring an illuminated center red dot with adjustable brightness to contrast against dark backgrounds.
• 30mm Main Tube: A rugged, one-piece aluminum tube design that ensures durability and structural integrity under heavy recoil.
• Knob Synergy System: Standard capped turrets with 1/4 MOA click values that are fully compatible with custom ballistic knobs.
• Weatherproof Construction: Nitrogen-filled, waterproof, fog-proof, and shockproof build designed to withstand harsh outdoor environments.

Product Specifications

• Magnification: 3x to 12x
• Objective Lens Diameter: 56 mm
• Tube Diameter: 30 mm (high or extra-high mounting rings recommended)
• Reticle: Illuminated 4A-I SFP (powered by 1x CR2032 battery)
• Length: 11.2 inches (approx. 284 mm)
• Weight: 20.2 oz (approx. 573 grams)
• Field of View: 36.5 ft to 9.0 ft @ 100 yards (12.2 m to 3.0 m @ 100 m)
• Eye Relief: 2.91 inches to 3.38 inches (approx. 74 mm to 86 mm)
• Exit Pupil: 9.7 mm (at 3x) to 5.0 mm (at 12x)
• Adjustment Click Value: 1/4 MOA
• Total Elevation/Windage Adjustment: 95 MOA / 95 MOA
• Parallax: Fixed at 100 yards (91.4 meters)

Who is the Fullfield 3-12x56mm 4a Illum Ksb for?

• Low-light and twilight big game hunters — targeting game in deep dusk, early dawn, or heavily overcast conditions is made highly effective by this low-light hunting riflescope's massive 56mm objective lens, which maximizes light gathering when ambient light is critically low.
• Medium-to-long range stalkers — hunting in dense timber and varying terrain benefit from the high-contrast targeting provided by this low-light hunting riflescope's 3x to 12x magnification range and fixed parallax at 100 yards.

Less suitable for: ultra-close quarters shooting under 25 meters due to the fixed 100-yard parallax, spring-piston air rifles due to the unique bi-directional reverse recoil, and lightweight mountain hunts where a smaller, lighter 40mm or 42mm objective riflescope is preferred over this 20.2 oz specialist optic.