Vortex Diamondback 3 9×40 review

Boasting to be one of the best brands in the manufacture of riflescopes, Vortex Optics has done it yet again with the vortex diamondback tactical 3-9x40. There’s nothing really fancy about the design of this one but even so, it boasts to have one of the best performances you could get on any scope in its class.

The optics are bright and clear, the adjustments user-friendly, the build quality top of the line and the installation amazingly easy.

So, is it really the kind of scope you could count on daily despite the outdoor conditions? Would it be a good enough pair up for your rifle as far as accuracy is concerned? Well, that's exactly why we're here today. Let's take a look at every reason you should settle with the vortex diamondback 3-9x40, shall we?

It's not always about the optics but instead, any serious hunter will want the build quality to match up to the optics.

The last thing you want is having to fumble with the adjustments or the quality of the images deteriorating with time and with that, let’s take a look at why you can count on this bad boy to take you through lots of hunting seasons.

Aircraft grade aluminum design

For ultimate strength and rigidity, it is constructed from one-piece aircraft aluminum grade. The body of the tube features a 1-inch measurement which makes it easy to set up with mounting rings on your rifle.

The one-piece aluminum design also prevents the entry of moisture into the tube while at the same time being corrosion and rust resistant for longevity. Being aluminum, it weighs less as compared to other riflescope materials and the added weight will barely be felt on your rifle.

Yet another thing you’ll appreciate from the aluminum is its shockproof nature which conveniently protects the optics on the inside from high recoils.

Features exposed tactical turrets

Included on the diamondback tactical 3-9x40 are exposed windage and elevation turrets which allow for quick adjustments which will be really resourceful during a hunt. There is also a zero-reset turret which makes the adjustment back to zero quick and easy.

The maximum elevation and windage adjustments are both 80 MOA whereas the travel per rotation of the turrets is 12 MOA

Fast focus eyepiece

Besides the quick adjustment turrets, there is also a fast focus eyepiece included which allows for quick and easy reticle focusing. Speaking of the reticle, it's worth mentioning that the vortex diamondback 3-9x4 features a second focal plane reticle that is close to the eyepiece and behind the image erecting and magnifying lenses.

Regardless of whether you have the magnification at high or low power, the vortex diamondback tactical 3-9x40 will maintain the size of the reticles. So, as far as hunting is concerned, this bad boy is guaranteed to give you utmost accuracy.

Waterproof and fog proof design

Boasting to have a nitrogen purging and an O-ring seal, you can count on this bad boy to keep the moisture out despite the hunting situations. Whereas the O-ring seal will work flawlessly in preventing the entry of water during a downpour the nitrogen purging, on the other hand, functions to expel any moisture from within the scope hence giving you consistent clarity.

That’s not all…

There’s a raised rib on the magnification ring which facilitates for fast magnification changes when the need to do so arises. The scope also features a fiber optic radius bar that visually assists the tracking of turret rotations.

The optics and internals

Moving on to the second part of our vortex diamondback 3 9x40 review, it’s time to see how good the optics really are.

Has got a 40mm objective lens

The larger the objective lens is, the better the performance of the riflescope. By including the 40mm objective on the diamondback tactical 3-9x40, light utilization will be optimal which then gets you really bright images. With the magnification ranging between 3x and 9x, it can conveniently be used for both short- and long-range shots.

Fully multi-coated optics

To back up the 40mm objective lens, the vortex diamondback 3-9x40 has got the XR fully multi-coated proprietary coatings which increase the light transmission. These also feature multiple anti-reflective coatings on all air to glass surfaces for use in different lighting conditions.

Has got the precision glide erector system

Something else you’ll definitely appreciate on this bad boy is the use of premium components in the zoom lens mechanism which makes the magnification smooth- a feature that will come in handy especially in the harshest conditions.

The elevation and windage adjustments

With a maximum of 80 MOA, in either case, a 12 MOA travel per rotation and adjustment graduation of ¼ MOA, you couldn’t go wrong on the accuracy whatsoever


Regarding the parallax adjustment, it is set at 100 yards whereas the eye relief is at 3.9 inches which keeps your eye safe from any injury during a recoil.


  • XR fully multi-coated optics
  • Features a fast focus eye-piece
  • Comes with an aircraft-grade aluminum exterior
  • Exposed tactical turrets for quick adjustments
  • Features a raised magnification rib for quick magnification
  • Second focal plane reticles
  • O-ring sealed and nitrogen purged for water and fog-proofing


  • The zero-reset turret is a little stiff


Q:Does it come with a mil-dot reticle?

Q: What size of flip cap covers fit?

Q: does it come with a sunshade?

Final verdict

Summing up our vortex diamondback 3 9x40 review, you sure are going to get a bang for your buck on this one. The optics are top of the line the build quality durable, the adjustments friendly and the eye relief long and generous. This being the case, you’ll find this rifle quite dependable for both hunting and target shooting.

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