Nikko Stirling MountMaster 4×40 Rifle Scope with HMD Reticle
The Nikko Stirling MountMaster 4×40 is a one inch rifle scope equipped with a 3/8 inch mount, allowing direct installation on a 3/8 inch dovetail rail. The body is constructed from matte black alloy for durability and a sleek appearance. The lenses are multi-coated to enhance light transmission and reduce glare. It features Nikko Stirling’s Half Mil Dot (HMD) reticle for precise aiming. The scope is waterproof, fogproof, and shockproof, with a nitrogen fill to prevent moisture ingress. Windage and elevation adjustments are available in 1/4 MOA steps (7mm at 100m). A fast eye focus ensures quick adaptation to different viewing distances.
Specifications
| Feature | Detail |
|---|---|
| Optical Power | 4x |
| Objective Lens Diameter | 40mm |
| Reticle Type | Half Mil Dot (HMD) |
| Mount Type | 3/8 inch |
| Adjustment | 1/4 MOA (7mm at 100m) |
| Eye Focus | Fast eye focus |
| Environmental Protection | Waterproof, fogproof, shockproof, nitrogen-filled |
FAQ
What is the reticle type included in this scope?
The scope features Nikko Stirling’s Half Mil Dot (HMD) reticle for accurate aiming.
Is the scope compatible with standard 3/8 inch dovetail rails?
Yes, the scope comes with a 3/8 inch mount and is designed to fit directly onto standard 3/8 inch dovetail rails.
Does the scope have any environmental protection features?
Yes, it is waterproof, fogproof, and shockproof, and is nitrogen-filled to prevent moisture ingress.

Ella Sutherland –
The scope is easy to install and fits perfectly on my rifle’s rail. The HMD reticle is clear and helps with accurate shot placement. The multi-coated lenses perform well in varying light conditions. I’ve used it in different weather, and it remains reliable without fogging or moisture issues.
Gordon Ellison –
Good build quality and solid performance. The 4×40 magnification is ideal for medium-range shooting. The windage and elevation adjustments are precise. I appreciate the fast eye focus, which makes it quick to use in the field.
Diana Miller –
Outstanding clarity and durability. The scope stays fog-free even in cold, humid conditions. The HMD reticle is easy to read and improves accuracy. It’s a reliable choice for hunting and target practice.