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Diamondback 4-12x40 AO

V-Plex Reticle | 1 Inch Tube

Discontinued

Diamondback 4-12x40 AO Click to Enlarge
SKU: DBK-412PL
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MSRP: $349.00
*Prices in US Dollars
Reviews:
Diamondback 4-12x40 AO is rated 4.8 out of 5 by 43.
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Diamondback® 4-12x40 AO Riflescope

The Diamondback® — loaded with features! First, the solid one-piece aircraft-grade aluminum alloy construction makes the Diamondback® riflescope virtually indestructible and highly resistant to magnum recoil. Argon purging puts waterproof and fogproof performance on the agenda, and advanced fully multi-coated optics raise an eyebrow when crystal clear, tack-sharp images appear in the crosshairs. Look for all this and more in a riflescope you'd expect to cost quite a bit more-but doesn't. We can live with that.

  • 4-12x40 riflescope is ideal for big game, predator/varmint, muzzleloader, slug shotgun, long range, and target applications.
  • V-Plex reticle is the single best all-purpose hunting reticle intended for a wide variety of hunting applications.
  • Adjustable objective (AO) allows maximum precision on small targets.



VIP Warranty Argon Purged Waterproof
Magnification4-12 x
Objective Lens Diameter40 mm
Eye Relief3.1 inches
Field of View32.4-11.3 feet/100 yards
Tube Size1 inch
Turret StyleCapped
Adjustment Graduation1/4 MOA
Travel per Rotation15 MOA
Max Elevation Adjustment60 MOA
Max Windage Adjustment60 MOA
Parallax Setting10 yards to Infinity
Length12.8 inches
Weight17.2 ounces
Product Manual (PDF)Download
Included in the Box
  • Removable lens covers
  • Lens cloth

Optical Features

Fully Multi-Coated Increases light transmission with multiple anti-reflective coatings on all air-to-glass surfaces.
Second Focal Plane Reticle Scale of reticle maintains the same ideally-sized appearance. Listed reticle subtensions used for estimating range, holdover and wind drift correction are accurate at the highest magnification.

Construction Features

Tube Size 1-inch diameter.
Single-Piece Tube Maximizes alignment for improved accuracy and optimum visual performance, as well as ensures strength and waterproofness.
Aircraft-Grade Aluminum Constructed from a solid block of aircraft-grade aluminum for strength and rigidity.
Waterproof O-ring seals prevent moisture, dust and debris from penetrating the riflescope for reliable performance in all environments.
Fogproof Argon gas purging prevents internal fogging over a wide range of temperatures.
Shockproof Rugged construction withstands recoil and impact.
Hard Anodized Finish Highly durable low-glare matte finish helps camouflage the shooter's position.
Precision-Glide Erector System Uses premium components in the zoom lens mechanism to ensure smooth magnification changes under the harshest conditions.
Capped Reset Turrets Allow re-indexing of the turret to zero after sighting in the riflescope. Caps provide external protection for turret.
Adjustable Objective Adjustment for riflescope's objective lens provides image focus and parallax removal.

Internal Mechanism Design Features

Precision-Glide Erector System Uses premium components in the zoom lens mechanism to ensure smooth magnification changes under the harshest conditions.

Convenience Features

Fast Focus Eyepiece Allows quick and easy reticle focusing.
Magnification4-12 x
Objective Lens Diameter40 mm
Eye Relief3.1 inches
Field of View32.4-11.3 feet/100 yards
Tube Size1 inch
Turret StyleCapped
Adjustment Graduation1/4 MOA
Travel per Rotation15 MOA
Max Elevation Adjustment60 MOA
Max Windage Adjustment60 MOA
Parallax Setting10 yards to Infinity
Length12.8 inches
Weight17.2 ounces
Product Manual (PDF)Download

Diamondback 4-12x40 Dimensions

Lengths
L1 L2 L3 L4 L5 L6
12.8 2.2 2.0 5.5 4.2 3.1
Heights
H1 H2
2.06 1.69

Dimensions measured in inches.

V-Plex Reticle (MOA)

A popular all-purpose hunting reticle intended for a wide variety of hunting applications.

Subtension detail for the Diamondback 4-12x40 V-Plex Reticle. >

Rated 5 out of 5 by from I sell hundreds of these for good reason I work for a gun company that sells Vortex Products. When customers buy a gun and ask for a suggestion of optics I almost always suggest Vortex; specifically the Diamondback. The Diamondback series is a great bang for the buck. The glass is clear even when there is little light. The scope is user friendly with easy to adjust settings. All of this is combined with their awesome customer service and lifetime warranty. I frequently have customers return and thank me for introducing them to Vortex. It is at that point that they usually buy another one for their other rifles. If your looking for a scope that has double the value of your money, look no further than the diamondback series.
Date published: 2017-06-15
Rated 5 out of 5 by from High quality at a low price point. I use my Diamondback 4-12x40 on an AR10 platform I put together in 2016. The rifle itself is a "budget build" of sorts so I wasn't expecting any crazy performance out of it. With the optic listed above I'm able to shoot MOA at 100 yards so far. The price I paid for my first ever Vortex product, this Diamondback 4-12x40, led me to believe it was of median quality. Once mounting the optic and actually using it I was blown away by the quality of the fit and finish and the clarity of the glass. They're simply amazing optics. I will be using Vortex products on all of my future builds. Thank you.
Date published: 2017-06-15
Rated 4 out of 5 by from Great Scope I purchased this scope after having issues with multiple Bushnell scopes on my elk rifle. The scope is bright and crystal clear and after a few hundred rounds, still holding zero. The adjustments are accurate however, on my scope, it was easy to go two clicks instead of one because of how easy the knobs turn. I called Vortex to ask about this. It took just a minute to speak to a real life, English speaking person. They told me that it was common with their scopes and assured me that it was not a malfunction. I have not had any issues with the scope. I have not had to use their warranty, but have heard it is second to none. Because they make excellent products, have an unbeatable warranty, and are a family, veteran owned company; I will not buy optics from anyone else.
Date published: 2017-06-15
Rated 5 out of 5 by from Best Scope I've Ever Bought I bought this scope 2 years ago at my local gunshop. I was very impressed with the clearness and ease of use. On the first day of the 2015 PA rifle season I was walking down off the side of a bank and fell straight onto my back an landed with all my weight right on my rifle and scope. After I got back up and checked over my rifle I noticed a big "scrape mark" on my scope, by this point I figured my day was done. That was not the case st approx 1:53PM I had a really nice 8 point come out on the power line above me. 1 shot at 163 yards off hand and that was all she wrote. Scope was still dead on. I am now a firm believer in Vortex Optics. Also there customer service is out of this world. Keep up the great work everyone. You build an awesome product at very affordable prices.
Date published: 2017-06-15
Rated 4 out of 5 by from Very Pleased I purchased this scope on sale at Cabela's and mounted it to my custom Ruger 10/22. With the AO it's a great option for this platform and I'm sure it's 100% at home on other rifles as well. It suits my purpose extremely well with one caveat, the eye relief isn't as generous as I expected after reading the review. I have to get about an 1" from the eye piece for proper view even with the correct cheek weld. Still, amazing on a .22 rifle and would do well on other light recoiling rifles.
Date published: 2017-06-15
Rated 5 out of 5 by from Best scope I've ownef Bought this scope for my .223. Love this scope, great durability, your yardage adjustments for the price on the box you can't go wrong. Had a problem bore sighting the scope due to my error it needed repairs. Sent it in received a call about 2 days later from the tech working on it. Fixed the issue and had my scope back within a week and all it cost was the shipping. Phenomenal customer service and outstanding turn around time. Would buy a Vortex for any gun I buy in the future.
Date published: 2017-06-15
Rated 5 out of 5 by from Quality afordable scope Mounted on my 700 .270. Cant beat the price, quality and the warranty. This gun accidentally fell off of my passenger seat onto the ground last year after filling my deer tag. The scope took a direct hit. I looked through it and saw that the crosshairs were still intact, not happy but thankful it didn't look broke. I had to re sight it in as it was shooting left but was still on the paper, sighted it in and does not seem to have a problem! Great products!
Date published: 2017-06-15
Rated 2 out of 5 by from Great glass, horrible eye relief I used this scope for 1 season. I was very impressed with the glass quality and low light abilities. However, the eye relief is horrible. I installed this scope on a Remington 700 30-06, and the scope would hit me in they eye every shot. (I have never been hit with a scope before, and have I am used to shooting 300 win.) Great scope for the money, but I would not put it on a gun that kicks hard.
Date published: 2017-06-15
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Does this scope have a wire, or etched glass reticle? Also, what is the country of manufacture? Thanks

Asked by: R700
The Diamondback has a wire reticle and is manufactured in the Philippines.
Answered by: Mike at Vortex Optics
Date published: 2017-12-05

Is there a sunshade that will fit the DBK-412B AO?

Asked by: clizardi
We do not make a sunshade that fits the Diamondback scopes, but you can get a universal sunshade from www.mkmachining.com.
Answered by: Mike at Vortex Optics
Date published: 2017-11-12

What range should I sight this scope in at. I am using this scope on a Thompson center rifle in a .300 win mag.

Asked by: Sharbait
The distance you sight in is personal preference, I like sighting in at 200 yards for my hunting rifle, but a 100 yard zero is very common as well.
Answered by: Mike at Vortex Optics
Date published: 2017-08-15

Can this scope handle the double recoil of a springer air rifle? i would like to mount one on my RWS / Diana Model 34 Springer air rifle.
Asked by: al
That will work well for your air rifle. You'll need to make sure to use 15-18 in lbs on the screws on the rings and no Loctite for best performance.
Answered by: Jon from Sales
Date published: 2017-06-23

I'm fixing to buy a Vortex scope for my new Diamondback AR10. I need rings saw where you all said the 1" ring height I believe? Plus my biggest question is on the Diamondback 4x12-40. is the 4x12-40 AO really worth the extra 0 over the 4x12-40? Thanks guys. Really like your optics I've seen on my buddies gun.
Asked by: Smokey
I would recommend a 1 inch cantilever mount for putting a Diamondback on an AR 10. The AO is nice for long range shooting because you can tune out any parallax with the adjustable objective. Whether that is worth the extra 0 is up to you.
Answered by: Mike at Vortex Optics
Date published: 2017-06-15

Was wondering what height rings would work best for an AR10 platform, guessing medium but wanted to double check
Asked by: grunt
For an AR 10 you will want to go with our 1 inch cantilever mount to get to proper mounting height.
Answered by: Mike at Vortex Optics
Date published: 2017-06-15

I am going to mount this on a 10/22 for target use on a Picatinny rail. Because I also use a red dot scope on that rifle, I need removable rings. What do you recommend?
Asked by: Brad Ford
Check out the Leupold QRW rings, they should work well for that application.
Answered by: Jon from Sales
Date published: 2017-06-15

I need to scope a CZ 455 22LR varmint rifle. I have read that the bolt may hit the rear of various scopes. I'm aiming to use this primarily at a 100 yards for small game and paper. Considering all this, what are your recommendations for ring height, scope power and which product line? I have researched the crossfire ii line and the diamondback. I'm budget conscience but do realize this to be a lifetime purchase so am willing to consider higher price options if the quality and design fit this rifle the best.
Asked by: savvy
Thanks for taking the time to write in if you could call us at 800-426-0048 we'd be more than happy to discuss this matter with you in order to find the perfect fit. There is quite a bit of discourse to be had on the subject to find what will work best.
Answered by: Jon from Sales
Date published: 2017-06-23
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