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Nikko Mountmaster 3-9x40 Parallax AO Half Mil Dot Rifle Scope with 9-11mm Mount Rings

Out of stock
1/4 clicks. 32cm long. Superb Nikko quality at a budget price, parallax adjust with 3/8" 9-11mm mount rings, a great all rounder scope
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Nikko Stirling Mountmaster 3-9x40 Half mil dot Parallax AO Rifle Scope with 9-11mm Mount Rings - NMM3940AO

Mounts to fit it onto a standard air rifle base are included
Nikko Match Rings to fit 3/8" (9-11mm) width dovetail grooved air gun type base are supplied.


Premium quality air rifle and rimfire scope at a budget price.

>>> Half Mil Dot reticle for reliable and effective range estimating.

>>> 25mm/1 inch tube with multi coated lenses

>>> For all air rifle and rimfire.

  • Full size 1 piece 25mm tube
  • Waterproof - Shockproof - Fogproof - Recoil proof
  • Nitrogen filled and sealed tube
  • Parallax adjustable from 10 yards to infinity

Genuine Nikko Stirling rifle scope. UK importer supplied with UK warranty.

Half Mil Dot Reticle cross-hairs


Diagram below is a standard mil dot. The Half mil dot adds a dot in the middle to make the reticle even more precise


40mm Fully Multi Coated Lens:

  • A great medium size lens
  • Fast target acquisition and moving target tracking.
  • Fully multi coated

3-9x variable magnification

  • A popular all round variable magnification that is especially well suited to air rifle and rimfire shooting ranges.
  • Very easy and very fast dial adjustment.
  • Exceptional clarity

Ocular focus at 5 yards. Parallax from 10 yards.

Zero it with Windage and Elevation Turrets:

Windage/elevation target turrets with finger click adjustment.

140 click range (1/4 MOA) 7mm at 100m

Parallax Adjustment


Parallax Focus Adjustment - AO - Adjustable Objective (front lens casing)

Parallax effect is the term that describes the difference in angles between objects that are seen up close and those seen far away. When you look at telephone poles passing by on the side of the road, those closest to your car seem to pass very fast, while the ones far away seem to go very slow. That difference is due to the parallax effect.

The reticle in your scope is like a telephone pole that's very close. If you move your head on the stock while watching the target through the scope the reticle may seem to move, wobble or blur against the target. That affects where you perceive the aim point to be, and that affects your accuracy. Parallax focus correction adjustment reduces this phenomenon to the greatest extent possible.

Parallax focus correction therefore is a must for anyone attempting to use either a high magnification scope, shooting drastically different yardages with the same scope or anyone attempting to shoot at extremely close ranges or extremely long ranges. Especially so if it is a combination of these factors.

This scope features Parallax focus correction


  • Length: 32cm
  • Weight: 536 grams with mounts fitted
  • Exit pupil: 10mm
  • Colour and finish: Matte black
  • FOV 4.0-11.9 m at 100m
  • Click value 7mm at 100m
  • Eye relief - 85mm

Own this product? Write a review.
Ian Skeldon
from Cheshire

I thought I would try this scope as my other rifles have a different make fitted and I wanted to try something without a big outlay.

Wow, the clarity is amazing, make no bones about it, the viewing is laser sharp and not too fussy with relief. Works well from about 7 yards out to as far as I can shoot. If this scope will do a full year of shooting (I shoot a lot) and remain this good throughout, I will change my other scopes for these.


Thanks Ian, much appreciated and always good to hear :) We sell a lot of these, very popular especially in some overseas remote places where there is no or little gunsmith support as they are so solid and flexible, a real AK47 of a scope

Brand Nikko Stirling
Code NW332
Weight 0.85kg
EAN 9420008962703
Click value 1/4 MOA