Description
Rifle Scope Product Details
Barska AC12178 Contour Rifle Scope 2×20 Long Eye Relief, 30/30 Reticle
2×20 Compact Contour, Black Matte, 30/30 Reticle, 1/2″ MOA, 100% waterproof, fog proof and shockproof, Fully Coated optics, Compact in size and low magnification making them adaptable to a wide variety of shooting activities, Extra rigid shockproof construction.
Rifle Scope Product Features
About this item
Precision Aiming: The 2x magnification scope features 1/2 MOA click adjustments for precision accuracy.
Quality Construction: The scope comes with fully coated optics, providing impressive viewing clarity. Tube diameter 1″.
30/30 Reticle: The scope comes with 30/30 crosshair reticle for easy targeting, ideal for any type of shooting.
Long Eye Relief: The scope offers low magnification combined with long eye relief, ideal for close range actions.
100% waterproof, fog proof and shockproof
Fully Coated Optics
Scope Caps included
AC12178
Specs
Item: AC12178
Field of View(ft @ 100yds): 10.47 @ 2x
Eye Relief: 11.8″
Exit Pupil: 9.5mm
Click Value: 1/2 MOA
Focal Plane: Second
Length: 8.5″ ; Weight: 6.6 oz ; 1″ Tube Diameter
Included: Scope Caps and Lens Cloth
2x20mm Contour Rifle Scope
by Barska
Performance that doesn’t stop short. Barska’s Contour Series meets the hunters demands by combining performance and innovation into a compact riflescope without sacrificing ruggedness, dependability or craftsmanship. The Contour Series of scopes are engineered with extra rigid shockproof construction to handle the demands of pistols, shotguns, and other types of high recoil firearms. This series is a clear winner for various types of shooters and hunters in the field.
2x Magnification
20mm Objective Lens
Fully-coated Optics
Waterproof, Fogproof and Shockproof
30/30 Reticle
Extreme Long Eye Relief
Durable, Light Weight Riflescope
This 2×20 Contour riflescope is durable and lightweight, perfect for hunting or target practice.
Crosshair Reticle
The scope comes with a crosshair 30/30 reticle, allowing the shooter to easily aim at the target.
Magnification
2x magnification allows users to get up close to the target, suitable for short-range targeting.
Accessories
The scope comes with scope caps and lens cloth.
AC12178 AC12184 AC10882 AC11876 AC12180 AC12182
Magnification 2x 4x 4x 4x 2.5x 4x
Objective Lens 20mm 32mm 32mm 32mm 20mm 32mm
Lens Coating Fully Coated Fully Coated Fully Coated Fully Coated Fully Coated Fully Coated
Click Value 1/2 MOA 1/4 MOA 1/4 MOA 1/4 MOA 1/4 MOA 1/4 MOA
Reticle 30/30 Crossbow 30/30 Illuminated Mil-Dot 30/30 Crossbow
Turret Capped Capped Capped External Capped Capped
Length 8.5″ 9″ 7.48″ 9″ 7.25″ 9″
Product Weight 6.6 oz 9.2 oz 8.29 oz 10.4 oz 7.5 oz 9.2 oz
About the BARSKA Brand
BARSKA is a premium maker for long gun scopes, optics, mounting solutions, and other components used for firearms like rifles and long guns. They create and manufacture their mounts and related products making the most of elements which are resilient and long lasting. This includes the Barska AC12178 Contour Rifle Scope 2×20 Long Eye Relief, 30/30 Reticle by BARSKA. For additional shooting products, visit their website.
Glass Facts
Rifle scopes enable you to specifically aim a rifle at various targets by aligning your eye with the target over a range. They do this through magnification by using a series of lenses inside the scope. The scope’s alignment can be adapted for the consideration of many environmental factors like wind speed and elevation increases to make up for bullet drop.
The scope’s purpose is to help the shooter understand precisely where the bullet will hit 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 contemporary rifle optics have around 11 parts which are located internally and externally on the optic. These optic pieces include the rifle scope’s body, lenses, windage and elevation turrets or dials, focus rings, and other elements. Learn about the eleven parts of rifle glass.
Rifle Scope Types
Rifle scopes can be either “first focal plane” or “second focal plane” type of optics. Going for the best type of rifle scope depends on what type of shooting you plan on doing.
Info About First Focal Plane Glass
Focal plane scopes (FFP) come with the reticle in front of the magnification lens. This causes 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 amplified range as they are at the non magnified range. For instance, one tick on a mil-dot reticle at 100 yards without having “zoom” is still the very same tick at 100 yards with 5x “zoom”. These types of scopes are beneficial for:
- Quick acquisition, long distance types of shooting
- Shooting circumstances where calculations are minimal
- Experienced shooters who know their target “hold over” and “lead” ratios for their firearm
- Shooters who do not mind the reticle is bigger and uses up more visual sight space than a SFP reticle
About Second Focal Plane Glass
Second focal plane optics (SFP) feature the reticle to the rear of the magnification lens. In the FFP example with the SFP scope, the 5x “zoom” 100 yard tick measurement would be 1/5th of the non “zoom” tick.
- Long distance styles of shooting where shooters have additional time to make ballistic estimations
- Shooting where most of the shots take place within much shorter distances and ranges
- Shooters who prefer a clearer optic picture without area taken up by the larger sized FFP reticle
Rifle Optic Zoom
The quantity of zoom a scope offers is figured out by the diameter, thickness, and curvatures of the lenses inside of the rifle scope. The magnification of the scope is the “power” of the scope.
Fixed Single 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 zoom of this type of scope can not fluctuate because it is fixed.
About Variable Power Lens Scopes
Variable power rifle scopes can be changed between magnification power levels. It will list the magnification amount in a format like 2-10×32. These numbers mean the magnification of the scope can be changed between 2x and 10x power. This also utilizes the power levels in-between 2 and 10. The power modification is accomplished by working with the power ring part of the scope near the rear of the scope by the eye bell.
Power Levels and Range Correlations
Here are some advised scope power settings and the ranges where they can be effectively used. High power rifle scope glass will not be as beneficial as lower magnification level glass given that too much zoom can be a bad thing. The same goes for longer ranges where the shooter needs to have increased power to see where to properly aim the rifle at the target.
Rifle Scope Lens Coating
All top of the line rifle scope and optic lenses are coated. Lens covering can be a vital element of a rifle system when buying high end rifle optics and scope equipment.
Info on Lens Coatings – HD Versus ED
Some rifle glass makers will also use “HD” or high-def lense coatings that make the most of various procedures, polarizations, chemicals, and aspects to extract different color ranges and viewable definition through the lens. This HD coating is typically used with more costly, high density glass which decreases light’s opportunity to refract by means of the lens glass. Some scope corporations use “HD” to describe “ED” signifying extra-low dispersion glass. ED deals with how colors are represented on the chroma spectrum and the chromatic deviance or aberration which is also called color distortion or fringing. Chromatic aberration can be obvious around objects with hard shapes as light hits the item from particular angles.
Glass Lens Single Coating Versus Multi-Coating
Different scope lenses can even have different finishes applied to them. All lenses generally have at least some kind of treatment or finishing applied to them before being used in a rifle scope or optic assembly. Due to the fact that the lens isn’t simply a raw piece of glass, they require performance enhancing coatings. It becomes part of the finely tuned optic. It must have a finishing put on it so that the lens will be optimally functional in numerous kinds of environments, degrees of sunshine (full VS shaded), and other shooting conditions.
Single layered lenses have a treatment applied to them which is typically a protective and boosting multi-purpose treatment. This lens treatment can shield the lens from scratches while minimizing glare and other less beneficial things experienced in the shooting environment while sighting in with the optic. The quality of a single layered lens depends upon the scope maker and how much you spent on it. Both the manufacturer and amount are indications of the lens quality.
Some scope makers similarly make it a point to define if their optic lenses are coated or “multi” covered. Being “much better” depends on the producer’s lens treatment innovation and the quality of products used in building the rifle scope.
Scope Lens Hydrophobic Covering
Water on a lens does not assist with maintaining a clear sight picture through a scope at all. Numerous top of the line and military grade optic makers will coat their lenses with a hydrophilic or hydrophobic anti-water finishing.
Alternatives for Mounting Scopes on Firearms
Mounting solutions for scopes can be found in a couple of choices. There are the standard scope rings which are separately installed to the scope and one-piece mounts which cradle the scope. These different types of mounts also typically are made in quick release versions which use toss levers which permit rifle operators to quickly mount and remove the scope.
Hex Key Rifle Scope Rings
Normal, 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 a couple of different rings to support the optic, and are often made from 7075 T6 billet aluminum which are created for long distance precision shooting. This type of scope install is great for rifles which require a resilient, rock solid mount which will not move no matter how much the scope is moved or abuse the rifle takes.
Quick-Release Cantilever Optic Rings
These types of quick-release rifle scope mounts can be used to quickly attach and take off a scope from a rifle. Multiple scopes can also be swapped out if they all use a similar style mount. The quick detach mount style is CNC machined from anodized 6061 T6 aluminum and the mounting levers fasten tightly to a flat top type Picatinny rail. This lets the scope to be sighted in while on the rifle, taken off of the rifle, and remounted back on the rifle while maintaining precision. These kinds of mounts come in beneficial for rifles which are moved a lot, to remove the glass from the rifle for protection, or for sight systems which are employed between multiple rifles. An example of this mount style is the 30mm mount from the Vortex Optics manufacturer. It typically costs around $250 USD
Sealing and Gas Purging for Scope Tubes
Moisture inside your rifle optic can ruin a day on the range and your expensive optic by causing fogging and making residue within the scope’s tube. Most scopes protect against moisture from getting in the scope tube with a series of sealing O-rings which are waterproof. Usually, these water-resistant scopes can be immersed beneath 20 or 30 feet of water before the water pressure can force moisture past the O-rings. This should be sufficient moisture content prevention for basic use rifles for hunting and sporting purposes, unless you anticipate taking your rifle on your motorboat and are concerned about the optic still working if it falls overboard and you can still find the firearm.
Gas Purged Rifle Glass Tubes
Another component of preventing the accumulation of wetness inside of the rifle scope’s tube is filling the tube with a gas like nitrogen. Since this space is already occupied by the gas, the glass is less altered by temperature level changes and pressure differences from the external environment which may potentially allow water vapor to permeate in around the seals to fill the void which would otherwise exist. These are good qualities of a decent rifle scope to seek out.
