Diamondback 4-12x40


Diamondback 4-12x40 is rated 4.8 out of 5 by 234.
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MSRP $269.99


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.

Magnification 4-12x
Objective Lens Diameter 40 mm
Eye Relief 3.1 inches
Field of View 32.4-11.3 ft/100 yds
Tube Size 1 inch
Turret Style Capped
Adjustment Graduation 1/4 MOA
Travel Per Rotation 15 MOA
Max Elevation Adjustment 60 MOA
Max Windage Adjustment 60 MOA
Parallax Setting 100 yards
Length 12 inches
Weight 14.6 oz




Fully Multi-Coated Proprietary coatings increase 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.


Tube Size 1 inch diameter tube offers a versatile blend of adjustment, size and weight for a wide variety of shooting applications.
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 binocular 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 hard-coat anodization provides a low-glare matte surface and helps camouflage the shooter's position.
Capped Reset Turrets Allow quick re-indexing of the turret (no tool needed) to zero after sighting in the riflescope. Caps provide external protection for turret.


Precision-Glide Erector System This system ensures the components in the zoom lens mechanism glide smoothly and cleanly through all magnification ranges.


Fast Focus Eyepiece Allows quick and easy reticle focusing.


Please select Reticle.



Rated 5 out of 5 by from great scope, great price, and yes I own a couple The scope holds up beautifully to heavy recoil. It's clear with easy target acquisition. I recommend that you use the Vortex site to input your load information for your BDC, it'll give you a good idea of the ranges for your BDC. The Vortex warranty is the best on the market. I had smoke damage to a couple scopes, called them up, sent the scopes in, and not only did they replace the scopes but the package came with a couple t-shirts and hand written note. The folks at Vortex went above and beyond with their customer service. They make excellent products and their customer service is the best in the business.
Date published: 2017-06-15
Rated 5 out of 5 by from Great scope that that won't kill the bank account. I needed a scope after the factory mounted one that came with my rifle broke after the first trip to the range. Vortex was not a brand I was even aware of, I saw it the display case next to the Nikons (which what I had intended to purchase before walking in). The salesman showed me the diamondback it had a clear crisp view and was easy to focus, it held a good clear view even through all magnifications. The selling point for was the VIP warranty. It sounded so good when I needed another scope for a new rifle I didn't look at any other brands, and when I finally buy that .300 win mag I want I will have another Vortex sitting on top.
Date published: 2017-06-15
Rated 4 out of 5 by from Good scope. Great warranty! I bought the Diamondback 4-12X40 a few months ago. The clarity is good and the BDC cross hairs are sharp. While the Diamondback might be on the lower end of Vortex's product lines, it is still better than many scopes that cost more. The reason that I so often choose Vortex is their outstanding warranty. I have had to send a broken scope back to Vortex before (my mistake, not theirs) and I have never had a more positive and helpful customer service experience before. They stand behind their superior products. Keep up the good work Vortex!
Date published: 2017-08-06
Rated 5 out of 5 by from Much better than expected The value of the Diamondback scopes cannot be beat. I purchased this scope for a .308 savage bolt action rifle. After a Simmons scope I was blown away by everything, visual clarity and quality are excellent and eye relief was perfect (the Simmons smacked me occasionally, a 6.5lb 308 jumps). After several sessions at the range it has held zero, even after an accidental drop in my garage. If I was a better shooter I'm sure I could say more, but compared to almost anything under $400 msrp it's hard not to see the value in this scope. I let a friend try it, he swears by Zeiss and only Zeiss. Since then he has bought 3 vortex optics.
Date published: 2017-06-15
Rated 5 out of 5 by from Tough, reliable, affordable I had been a dedicated Simmons man for near 25 years. Needing a new scope for a newly acquired .30-06 I looked through a lot of glass. I settled on the Diamondback BDC for practicality and pricing. I now have 3 and have never regretted it. From hunts in Michigan, Wisconsin, Texas, Wyoming and Colorado they have always maintained zero even after a 1200 mile truck ride, a 4 mile pack horse trek and a week of temperature fluctuations from 50 degrees to 15 degrees. My grandsons will get my rifles and it's good to know that IF anything goes wrong, the unmatched Vortex warranty will have them covered. Should I need another scope I may try the Tactical version.
Date published: 2018-02-04
Rated 5 out of 5 by from Clear glass, pinpoint accuracy! I bought this scope for my Savage 110 30-06, and had it properly mounted within minutes. I cannot tell you how excited I was to build my confidence with my new hunting setup. the initial sight in was quick and to the point, and within 5 shots I was hitting targets out at 400 yards. Not much later several beginner shooters that have never shot a high caliber rifle were hitting targets out to 200 yards without to much difficulty. this setup gives me the confidence to take the shot. unfortunately I didn't get to tag out on a deer this past year but have high hopes for the coming season. You wont regret buying this product.
Date published: 2018-03-07
Rated 5 out of 5 by from Good scope for the money I purchased this scope a few years ago and it’s served me well. I put this scope on my AR-10 that I use for deer season and coyotes and it’s done it’s job. It’s been dropped, been in down pours, back of a feed truck, etc...never had any problems. The sight picture is good and I never have to mess with it. The only complaint I can think of is the adjustments feel a little mushy? It’s not a nice sharp click like some other scopes. This is not enough deterrent for me to choose a different scope though. You just have to pay attention when you’re making the adjustments.
Date published: 2018-03-02
Rated 5 out of 5 by from Excellent scope for excellent shots My father purchased this scope for a Colt LE901 chambered in .308. We had iron sights before, and were able to shoot proficiently enough, but nothing extravagant. However, putting this scope on changed the name of the game for us. I sighted it in with 2 shots at 25 yards, 2 at 50 yards, and 2 at 100 yards. I had never had this easy of a time sighting in a rifle. This was assuredly the most user friendly, easy to use scope that I've ever handled. Everyone who has shot the rifle since has complimented the choice of scope, and how clear the view is, and there is no lack of eye relief. I wish I had the resources to outfit each rifle I had with one of these. I have no complaints.
Date published: 2017-06-15
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