Description
Last update on August 9, 2022 // Source: Amazon API
Rifle Scope Product Details
Monstrum 3-12×42 AO Rifle Scope with Illuminated Mil-Dot Reticle and Offset Reversible Scope Rings
Rifle Scope Product Features
About this item
Adjustable 3-12 times magnification, for targeting out to 500 yards and beyond
Adjustable reticle illumination with 5 brightness levels in both red and green, allowing for better reticle visibility at night or in low light environments
An adjustable objective lens ” or AO – that allows for sharper focus of the target image, elimination of parallax, and range estimation
A mil-dot reticle with markings that allows you to estimate range or compensate for bullet drop
Aircraft grade 6061 aluminum scope body with a sealed, nitrogen-charged tube for resistance to water and fog
The Monstrum Tactical S31242-R-RGAO-V2 is a reliable tactical scope great for close to mid-range shooting. Crystal clear optics with 3-12x magnification. This scope has a functionally designed Mil-dot reticle for easy movement calculations. All Monstrum scopes tubes are nitrogen filled for resistance to water and fog.
This scope has 1/4 MOA/click windage/elevation adjustments with the ability to lock the turrets and reset the zero.
The etched black reticle is always visible without illumination or can be lit red or green for better reticle visibility at night or low light environments.
The adjustable objective (AO) lens can be moved by the parallax dial on the side scope. This adjustment allows for a sharper target image, elimination of parallax, and range estimation.
Multi-layer lens coating, protects your scope lens from scratches, and fog, while improving the clarity of your vision.
Offset Scope Placement
The distinctive offset reversible design allows for added flexibility for scope placement and optimum eye relief. The rings extend forward 1.5 inches from the base and can be mounted in either direction, allowing for a variety of mounting options dependent on your preferred scope placement and your mounting system.
3-9×32 AO Rifle Scope 2-7×32 AO Rifle Scope 3-12×42 AO Rifle Scope 3-9×40 AO Rifle Scope
Magnification: 3-9x 2-7x 3-12x 3-9x
Reticle: Illuminated Rangefinder Illuminated Rangefinder Illuminated Mil-Dot Crosshair Reticle
Scope Range: Close to Mid Range, 400+ Yards Close to Mid Range, 300+ Yards Close to Mid Range, 500+ Yards Close to Mid Range, 500+ Yards
Eye Relief: 3.5-3.8 in 3.5-3.8 in 3-3.5 in 3.5-3.8 in
Scope Rings Included: Standard Medium Profile Standard Medium Profile Offset High Profile Offset High Profile Single Piece Mount
Tube Diameter: 1 in 1 in 30 mm 1 in
Illuminated Reticle: N/A
Shock, Water, and Fog Proof:
About the Monstrum Scope Maker
Monstrum is a premium supplier for rifle scopes, optics, mounting solutions, and other accessories used for guns like rifles and long guns. They style and build their products using elements which are long lasting and durable. This includes the Monstrum 3-12×42 AO Rifle Scope with Illuminated Mil-Dot Reticle and Offset Reversible Scope Rings by Monstrum. For additional shooting goods, visit their website.
What You Need to Know About Rifle Optics
Rifle scopes enable you to specifically aim a rifle at various targets by aligning your eye with the target at range. They accomplish this through zoom by making use of a set of lenses inside the scope. The scope’s alignment can be dialed in for consideration of separate environmental elements like wind and elevation decreases to account for bullet drop.
The scope’s function is to help the shooter understand precisely where the bullet will land based on the sight picture you are viewing through the optic as you align the scope’s crosshair or reticle with the target. The majority of modern-day rifle scopes have around 11 parts which are found inside and externally on the optic. These scope parts include the rifle scope’s body, lenses, elevation turrets or dials, focus rings, and other components. Learn about the eleven parts of optics.
The Varieties of Rifle Scopes
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Selecting the optimal type of rifle scope is based on what type of shooting you plan on doing.
About First Focal Plane Optics
First focal plane glass (FFP) include the reticle before the zoom lens. This triggers the reticle to increase in size based upon the level of zoom being used. The benefit is that the reticle measurements are the same at the magnified distance as they are at the non amplified distance. One tick on a mil-dot reticle at one hundred yards without “zoom” is still the identical tick at one hundred yards with 5x “zoom”. These kinds of scopes work for:
- Quick acquisition, far away kinds of shooting
- Shooting scenarios where calculations are marginal
- Experienced shooters who recognize their aim point “hold over” plus “lead” equations for their rifles
- Shooters who don’t mind the reticle is enlarged and uses up more visual sight space than a SFP reticle
Info on Second Focal Plane Scopes
Second focal plane optics (SFP) come with the reticle to the rear of the zoom lens. This triggers the reticle to remain at the very same overall size relative to the quantity of magnification being used. The outcome is that the reticle measurements evolve based upon the zoom chosen to shoot over greater distances considering the markings represent different increments which can vary with the magnification. In the FFP illustration with the SFP optic, the 5x “zoom” one hundred yard tick measurement would be 1/5th of the non “zoom” tick measurement. These particular kinds of scopes are useful for:
- Long distance styles of shooting where shooters have additional time to make ballistic estimations
- Shooting where most of the shots happen within much shorter distances and ranges
- Shooters who desire a clearer optic sight picture without space used up by the larger size FFP reticle
Optic Zoom
The level of scope magnification you need on your scope is based on the kind of shooting you like to do. Virtually every type of rifle optic provides some level of magnification. The level of zoom a scope provides is determined by the diameter, density, and curvatures of the lens glass within the rifle optic. The magnifying level of the optic is the “power” of the glass. This denotes what the shooter is looking at through the scope is magnified times the power aspect of what can normally be seen by human eyes.
Fixed Power Lens Rifle Glass
A single power rifle scope uses a magnification number designator like 4×32. This indicates the zoom power of the scope is 4x power and the objective lens is 32mm. The magnification of this type of optic can not change because it is set from the factory.
Variable Power Lens Glass
Variable power rifle scopes can be changed between magnification levels. It will note the magnification degree in a configuration such as 2-10×32. These numbers mean the zoom of the scope could be adjusted between 2x and 10x power. This also utilizes the power levels in-between 2 and 10. The power manipulation is achieved by operating the power ring part of the scope near the back of the scope by the eye bell.
The Power and Range of Rifle Optics
Here are some suggested scope powers and the ranges where they can be successfully used. High power rifle scope glass will not be as useful as lower magnification level optics due to the fact that too much magnification can be a bad thing. The exact same concept relates to extended distances where the shooter needs sufficient power to see exactly where to properly aim the rifle.
Lens Covering for Rifle Glass
All modern rifle optic lenses are layered. There are different types and qualities of glass lens coatings. Lens coating can be an essential element of a rifle’s setup when thinking about high-end rifle optics and targeting equipment. The glass lenses are among the most essential pieces of the glass as they are what your eye sees through while sighting a rifle in on the point of impact. The finish on the lenses protects the lens surface area and assists with anti glare from excess sunshine and color profiles.
HD Versus ED Lens Coatings
Some glass companies will also use “HD” or high-definition lens coatings which employ different procedures, elements, rare earth compounds, and polarizations to extract various color ranges and viewable definition through lenses. This high-def covering is frequently used with greater density glass which reduces light’s capability to refract through the lens glass. Some scope corporations use “HD” to refer to “ED” indicating extra-low dispersion glass. ED deals with how colors are represented on the chroma spectrum and the chromatic difference or aberration which is also called color distortion or fringing. Chromatic aberration is often visible over objects with well defined shapes as light hits the object from various angles.
Single Rifle Glass Lens Finish Versus Multi-Coating
Different scope lenses can even have various coatings applied to them. All lenses generally have at least some kind of treatment or finishing applied to them prior to being used in a rifle scope or optic assembly. Due to the fact that the lens isn’t just a raw piece of glass, they require performance enhancing coatings. It becomes part of the carefully tuned optic. It needs to have a covering applied to it so that it will be optimally usable in many types of environments, degrees of sunlight (full VS shaded), and other shooting conditions.
This lens treatment can protect the lens from scratches while lowering glare and other less beneficial things experienced in the shooting environment while sighting in with the scope. The quality of a single coated lens depends on the scope manufacturer and how much you paid for it.
Some scope makers similarly make it a point to specify if their optic lenses are covered or “multi” covered. Being “better” depends on the maker’s lens treatment technology and the quality of products used in developing the rifle scope.
Glass Lens Hydrophobic Coating
Water on a lens doesn’t assist with maintaining a clear sight picture through a scope at all. Lots of top of the line and high-end optic companies will coat their lenses with a hydrophobic or hydrophilic coating.
Optic Installation Choices
Mounting solutions for scopes are available in a few choices. There are the basic scope rings which are separately installed to the optic and one-piece scope mounts which cradle the scope. These different types of mounts also typically can be found in quick release variations which use throw levers which permit rifle operators to quickly install and dismount the scope.
Hex Key Rifle Glass Rings
Standard, clamp design mounting scope rings use hex head screws to mount to the flattop style Picatinny scope mount rails on rifles. These types of scope mounts use two different rings to support the optic, and are made from 7075 T6 billet aluminum which is developed for long distance accuracy shooting. This type of scope install is excellent for rifles which need a long lasting, sound mount which will not move no matter how much the scope is moved or abuse the rifle takes.
Glass Mounts with Quick-Release Cantilever Rings
These types of quick-release rifle scope mounts can be used to rapidly connect and take off a scope from a rifle. If they all use a similar style mount, several scopes can often be switched in the field. The quick detach design is CNC machined from anodized 6061 T6 aluminum and the mounting levers connect solidly to a flat top design Picatinny rail. This allows the scope to be sighted in while on the rifle, taken off of the rifle, and remounted while maintaining the original sighting settings. These kinds of mounts come in convenient for rifles which are transported a lot, to remove the glass from the rifle for protection, or for scopes which are used in between multiple rifles. An example of this mount type is the 30mm mount designed by Vortex Optics. It generally costs around $250 USD
Rifle Scope Tube Sealing and Gas Purging
Moisture inside your rifle scope can ruin a day of shooting and your costly optic by inducing fogging and making residue inside of the scope’s tube. Many scopes protect against moisture from going into the optical tube with a system of sealing O-rings which are water resistant. Usually, these water resistant optics can be submerged under 20 or 30 feet of water before the water pressure can push moisture past the O-rings. This should be sufficient humidity prevention for common use rifles, unless you plan on taking your rifle on a boat and are concerned about the optic still functioning if it is submerged in water and you can still find the gun.
Scope Gas Purging
Another component of avoiding the accumulation of wetness within the rifle scope tube is filling the tube with a gas like nitrogen. Since this space is already occupied by the gas, the glass is less influenced by temperature changes and pressure distinctions from the outside environment which might possibly enable water vapor to permeate in around the seals to fill the void which would otherwise be there. These are good qualities of a good rifle scope to seek out.
