Leupold Mark 4HD 2.5-10x42 Riflescope
- Objective Lens Diameter: 42 mm
- Mounting Type: Picatinny Mount
- Night vision: No
- Material Type: Aluminum
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
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ASIN: B0CS3SK5ZMModel: Mark 4HDCategory: Rifle Scopes
More from this brandAll Leupold rifle scopesOverview
A first focal plane 2.5-10x42mm riflescope in a 30mm tube, model 183738, with an illuminated TMR reticle, motion-sensor illumination shutoff and USA-based manufacture.
This revives the Mark 4 name on a modern optical platform rather than reissuing the older military-grade line, a distinction more than one reviewer with prior Mark 4 experience calls out directly.
- First focal plane illuminated TMR reticle
- M5C3 turret system with locking zero
- 100 percent waterproof, fogproof and shockproof
- Motion Sensor Technology extends battery life
Who it's for
Suits hunters and long-range shooters who want first focal plane ranging at any magnification and are comparing options in the same tier as premium European scopes.
Pros and cons
- First focal plane keeps ranging accurate at any zoom
- Motion-sensing illumination shutoff to save battery
- Glass clarity compares well to premium European scopes
- Designed, machined and assembled in the USA
- Small 12-review sample limits long-term zero retention data
- Premium price positioning noted against high-end glass comparisons
Performance notes
Because the reticle is first focal plane, it scales with magnification so range estimation stays accurate at any zoom level. Motion Sensor Technology shuts off the illuminated reticle after five minutes of inactivity and reactivates as soon as movement is detected, meant to extend battery life without the shooter managing it manually.
Specifications
| Brand | Leupold |
|---|---|
| Model | Mark 4HD |
| Dimensions & fit | |
| Objective Lens Diameter | 42 mmhigher than 58% of 309 rifle scopes |
| Construction & materials | |
| Material Type | Aluminum |
| Color | Matte Finish |
| Compatibility & installation | |
| Mounting Type | Picatinny Mount |
| Compatible Devices | Rifle |
| Included components | |
| Included Components | Riflescope |
| Other details | |
| Night vision | No |
| Sport Type | Hunting |
| Item Type Name | Riflescope |
Closest rivals on specs
Frequently asked questions
Is the reticle on the Mark 4HD first or second focal plane?
First focal plane, so the reticle scales with magnification for consistent range estimation.
Does the illumination turn off automatically to save battery?
Yes, Motion Sensor Technology deactivates the illuminated reticle after five minutes of inactivity and reactivates on movement.
Where is this scope made?
Leupold states it is designed, machined and assembled in the USA.