The Burris Fullfield IV 4-16x50mm Riflescope (Model BO201550) is a highly versatile, variable power hunting riflescope engineered for medium-to-long-range hunting, open-country stalking, and precision target shooting. Built on a standard 1-inch main tube, this optical system features a large 50mm objective lens and variable magnification from 4x to 16x. The Second Focal Plane (SFP) Ballistic E3™ Illuminated Reticle provides fast holdover estimations and features center-point illumination powered by a single CR2032 button cell battery, requiring no external mains power or charging adapters.

Key Features

• Ballistic E3™ Illuminated Reticle: Features integrated holdover marks for quick elevation and windage estimations out to 400 yards (365 metres), with center crosshair illumination controlled via a rotary dial.
• Advanced Optics: Premium multi-coated lenses paired with a 50mm objective lens maximize light transmission for high edge-to-edge clarity in low-light environments.
• Double Spring Turret System: Capped hunter-style turrets with a robust steel-on-steel design deliver reliable tracking and high recoil resistance.
• Burris Knob Synergy®: Allows the integration of custom ballistic knobs calibrated to specific ammunition velocities.
• All-Weather Performance: The nitrogen-filled tube is waterproof, shockproof, and fogproof, capable of handling heavy recoil from high-calibre centerfire rifles, rimfires, and spring-piston air rifles.

Product Specifications

• Model/SKU: BO201550 (Base Part Number: 201550)
• Magnification: 4x to 16x variable zoom
• Objective Lens Diameter: 50 mm (Outer bell diameter: 57.4 mm)
• Ocular Diameter: 42.16 mm
• Main Tube Diameter: 1 inch
• Overall Length: 12.3 inches (approx. 312 mm)
• Weight: 18.2 ounces (approx. 516 grams)
• Click Value: 1/4 MOA per click
• Max Elevation Adjustment: 54 MOA
• Max Windage Adjustment: 54 MOA
• Parallax/Focus: Side focus, adjustable from 25 yards (approx. 23 metres) to infinity
• Reticle Position: Rear Focal Plane (RFP / Second Focal Plane)
• Power Source: Low-voltage CR2032 button cell battery (no 240V/SAA certification required)

Who is the Fullfield 4-16x50mm E3 Illum Spa Ksb for?

• Open-country stalkers — prioritizing a lightweight variable power hunting riflescope, as this 18.2-ounce (approx. 516 grams) optical system minimizes physical bulk during extended, on-foot hunts over rugged terrain.
• Medium-to-long-range hunters — requiring reliable target acquisition out to 400 yards, utilizing the 4x to 16x variable zoom range and the integrated Ballistic E3 illuminated reticle to make rapid holdover adjustments.
• Low-light hunters — requiring optimal visibility during dawn and dusk, utilizing a large 50mm objective lens to maximize light gathering alongside an adjustable illuminated reticle for high contrast against dark targets.

Less suitable for: Target engagements beyond 400 yards where higher magnification and greater than 54 MOA of elevation or windage travel are required, or close-range shooting under 25 yards where the side focus parallax minimum threshold is exceeded. For these applications, a dedicated long-range precision scope with higher magnification (such as 6-24x) or a specialized close-quarters optic is better suited.