1. Introduction
This instruction manual provides comprehensive guidance for the proper use, setup, and maintenance of your Leupold Mark 5HD 5-25x56 (35mm) M5C3 FFP Riflescope PR2-MIL. Designed for precision and reliability, this riflescope is engineered to deliver exceptional optical performance in diverse conditions. Please read this manual thoroughly before operating the device to ensure optimal performance and longevity.

Figure 1: The Leupold Mark 5HD 5-25x56 Riflescope in Dark Earth finish.
2. Key Features
- Model #185071: Mark 5HD 5-25x56 (35mm) M5C3 FFP PR2-MIL with Dark Earth Finish.
- Professional-Grade Optical System: Offers unmatched light transmission for challenging lighting conditions and industry-leading glare reduction for clear images in harsh, direct light. Provides resolution and clarity suitable for professional use.
- Front Focal Plane (FFP): The reticle magnifies along with the image, allowing for accurate range estimation at all magnification settings.
- Durability: Designed, Machined, and Assembled in the USA. 100% Waterproof, fogproof, and shockproof construction ensures reliability in rugged environments.

Figure 2: Diagram highlighting key features such as the M5C3 ZeroLock Dial, side focus, 5:1 zoom ratio, 35mm maintube, and removable throw lever.
3. Setup
3.1 Mounting the Riflescope
The Leupold Mark 5HD is designed for use with a Picatinny Mount. Ensure the mounting rings (e.g., Leupold Mark 4 rings) are correctly sized for the 35mm maintube and securely fastened to your rifle's rail. Proper alignment and torque specifications are crucial for accuracy and to prevent damage to the scope or rifle.
3.2 Attaching Accessories
The riflescope includes a sunshade to reduce glare and a throw lever for quick magnification adjustments. The throw lever can be attached to the magnification ring for enhanced ergonomics. A screw plug is provided if the throw lever is not desired.
3.3 Initial Adjustments
- Diopter Adjustment: Adjust the eyepiece until the reticle appears sharp and clear to your eye.
- Parallax Adjustment: Use the side focus knob to eliminate parallax error at various distances. This ensures the reticle and target are in the same focal plane.

Figure 3: The riflescope ready for mounting and accessory attachment.
4. Operation
4.1 Magnification Adjustment
Rotate the magnification ring located near the eyepiece to adjust the power from 5x to 25x. The throw lever, if installed, facilitates rapid changes in magnification.
4.2 M5C3 ZeroLock Dials (Elevation and Windage)
The M5C3 ZeroLock Dials provide precise adjustments for elevation and windage. The elevation turret features a push-button ZeroLock system, preventing accidental adjustments. To adjust, pull the turret up, make your adjustments, and push it back down to lock. The windage turret is capped for protection.
The ZeroLock feature allows you to return to your zero setting quickly and reliably. As you dial up, the turret will pop up to indicate full rotations, helping you track your adjustments without looking away from the target.
4.3 PR2-MIL Reticle (First Focal Plane)
The PR2-MIL reticle is a First Focal Plane (FFP) design, meaning its subtensions remain accurate across all magnification settings. This allows for consistent holdovers and range estimation regardless of the zoom level. The PR2-MIL is designed for long-range speed and precision, providing a clean sight picture free of clutter for fast accuracy, hold-offs, and shot correction.

Figure 4: View through the riflescope showing the PR2-MIL reticle, designed for precision.
5. Maintenance
5.1 Cleaning the Optics
Use a soft, lint-free cloth and a lens cleaning solution specifically designed for optical surfaces. Gently wipe away dust and debris. Avoid using harsh chemicals or abrasive materials that could scratch the lenses.
5.2 Body Cleaning and Care
Wipe the riflescope body with a damp cloth to remove dirt and grime. Ensure all external surfaces are dry before storage. The Dark Earth finish is durable but can be scratched by sharp objects.
5.3 Waterproof and Fogproof Features
The Mark 5HD is 100% waterproof and fogproof. While designed to withstand harsh conditions, avoid unnecessary submersion. If the scope gets wet, wipe it dry with a clean cloth.
6. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Blurry image | Incorrect diopter or parallax setting | Adjust diopter for reticle clarity and parallax for target clarity at distance. |
| Turrets not adjusting | ZeroLock engaged (elevation) or cap on too tight (windage) | Pull up the elevation turret to disengage ZeroLock. Remove windage cap. |
| Inconsistent point of impact | Loose mounting rings or rail | Check and tighten all mounting hardware to specified torque settings. |
7. Specifications
| Attribute | Detail |
|---|---|
| Brand | Leupold |
| Model Name | Mark 5HD 5-25x56 (35mm) M5C3 FFP PR2-MIL Dark Earth |
| Model Number | 185071 |
| Color | Dark Earth |
| Product Dimensions | 15.7"L x 1.38"W x 15.7"H |
| Item Weight | 3 Pounds |
| Material | Aluminum |
| Objective Lens Diameter | 56 Millimeters |
| Compatible Devices | Rifle |
| Mounting Type | Picatinny Mount |
| Night Vision | No |
| Field Of View | 20.4 Feet |
| Reticle Type | First Focal Plane TMR (PR2-MIL is a TMR variant) |
| UPC | 030317040260 |

Figure 5: Detailed specifications for the Mark 5HD riflescope.
8. Warranty & Support
The Leupold Mark 5HD riflescope is backed by Leupold's legendary customer care and a lifetime guarantee. This warranty ensures performance and craftsmanship, covering repair or replacement of your Leupold scope, sight, binocular, or spotting scope for free, regardless of whether you are the original owner or not.
For detailed warranty information or technical support, please refer to the official Leupold website or contact their customer service directly. You can also visit the Leupold Store on Amazon for additional product information and accessories.