The Leupold Mark 4HD 2.5-10x42 M5C3 FFP Illuminated TMR riflescope (MPN: 183738) is a professional-grade optic designed to bridge the gap between tactical precision and lightweight maneuverability. Built around a 30mm maintube and featuring a 42mm objective lens, this riflescope offers a practical 2.5-10x magnification range with a 4:1 zoom ratio. It utilizes Leupold's elite optical system to maximize light transmission and deliver high-definition edge-to-edge clarity. Advanced lens coatings provide glare reduction under harsh, direct sunlight, making it highly effective in demanding Australian outdoor environments.

Key Features

• First Focal Plane (FFP) Illuminated TMR Reticle: The Tactical Milling Reticle scales with magnification, allowing for accurate range estimation and holdovers at any power setting. The illuminated reticle features eight brightness settings to suit varying ambient light conditions.
• Motion Sensor Technology (MST): To preserve the battery life of the single CR2032 3V lithium coin battery, the system automatically deactivates the illumination after five minutes of inactivity and instantly reactivates it upon detecting movement.
• M5C3 ZeroLock Turrets: This system provides tactile 0.1 MIL click adjustments, 10 MIL per revolution, and a total elevation adjustment range of 24.7 MIL. It features a physical return-to-zero stop and a visual revolution indicator to prevent accidental dial movement, while the windage turret is capped.
• Side Focus Parallax: Features a side focus parallax adjustment that dials down from 25 yards to infinity, ensuring sharp focus and parallax elimination across a wide range of distances.
• Standard Battery Compatibility: The low-voltage, self-contained illumination system runs on a single CR2032 coin battery. This standard battery is widely available across Australia at local supermarkets, hardware stores, and outdoor retailers, eliminating any need for specialized charging equipment.

Technical Specifications

• Manufacturer Part Number (MPN): 183738
• Model: LE183738
• Magnification Range: 2.5x to 10x
• Objective Lens Diameter: 42 mm
• Maintube Diameter: 30 mm
• Focal Plane: First Focal Plane (FFP)
• Reticle: Illuminated TMR (Tactical Milling Reticle)
• Weight: 21.5 ounces (approximately 610 grams)
• Total Length: 12.5 inches (approximately 31.75 cm)
• Eye Relief: 3.6 inches to 3.9 inches (91 mm to 99 mm)
• Field of View (at 100 yards): 42.2 feet at 2.5x to 11.0 feet at 10x
• Total Elevation Adjustment: 24.7 MIL
• Parallax Adjustment: Side focus from 25 yards to infinity

Who It Is For

The Leupold Mark 4HD 2.5-10x42 is engineered for shooters who require a high-performance crossover optic that does not add excessive weight to their setup. It is an ideal choice for Precision Rifle Series (PRS) gas-gun divisions, where rapid target acquisition and reliable tracking are paramount. For Australian recreational shooters and hunters targeting medium-sized game or managing pests in diverse terrain, the lightweight 610-gram design and 25-yard minimum parallax make it equally suited for close-range bush stalking and mid-range open-country shooting.