Diamondback 4-12x40


Diamondback 4-12x40 is rated 4.9 out of 5 by 333.
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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.

Build Your Own Custom Turret - Kenton Industries

Diamondback 4-12x40 Dimensions (in inches)
Product Dimensions Image
L1 L2 L3 L4 L5 L6
12.0 2.46 2.15 5.85 3.0 3.1
H1 H2
1.89 1.69
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 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 Big BANG for your Buck! I recently put this scope on a 6.8 spc AR build. 16x might be a little over kill but I love it. You can crank up all the way to 16x and this glass is clear. Planning on using this set up for deer this year and probably some coyotes too. With the range of this scope I should be able to reach out and touch some fur with ease. I would easily compare this scope to some higher end glass. With Vortex you get a lot more for the money you spend. Capped turrets are nice and they are easy to adjust. Didn't take long to zero it in to my rifle and has been holding its zero. You won't be disappointed with this purchase.
Date published: 2017-06-15
Rated 5 out of 5 by from Perfect hunting scope with just the right stuff! Having owned the predecessor to this scope, the 4-16x42 HP, I looked forward to buying a second Diamondback for another hunting rifle. the Diamondback line is perfect for anyone who wants a quality optic with clear glass, a lifetime warranty for those unexpected mishaps in the field, and a price point that is unbeatable anywhere else. Not to mention, Vortex’ Dead-Hold BDC reticle and supplementary instruction is perfect for New Mexican game hunting. Having used this on a Winchester Model 70 Featherweight in 30-06, I know that I can count on the repeatability if this riflescope, given the covered turrets and anti-reflective glass coating that’s incredibly useful in the field. Thanks again, Vortex!!
Date published: 2019-05-12
Rated 5 out of 5 by from This is an awesome scope, highly recommended I recently purchased this scope for a Remington 700 SPS Tactical .223 rifle. I have been playing around with doing some long range shooting and wanted a scope that offered a little different type of BDC reticle other than the usual BDC circles. The hash marks offered in the Dead Hold reticle work very well for MOA hold overs and windage adjustments quickly and accurately. The 4-16x gives me plenty of zoom for 500 plus yards and the clarity of the sight picture is awesome. I would highly recommend this scope for not only long range shooting but as a hunting optic as well. Very tough built scope combined with the anti fog and light gathering lenses makes it great for hunting as well.
Date published: 2017-06-15
  • y_2020, m_9, d_27, h_15
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