Diamondback 3-9x40


Diamondback 3-9x40 is rated 4.9 out of 5 by 115.
  • y_2019, m_5, d_24, h_7
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_115
  • loc_en_US, sid_DBK-3-9X40, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_vortex-optics
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getAggregateRating, 125.56ms
MSRP $269.99


The Diamondback riflescope completely changes the rules when it comes to “you get what you pay for”. The performance-to-price ratio on this classic go-to hunting scope is off the charts when it comes to image quality, build quality and overall feel of the turrets and the fast-focus eyepiece. If you’re in the market for a high-quality riflescope, look no further than the Diamondback—a quality riflescope that offers a variety of configurations at a price that will leave you with plenty of money left over for ammo.

Magnification 3-9x
Objective Lens Diameter 40 mm
Eye Relief 3.3 inches
Field of View 44.6-14.8 ft/100 yds
Tube Size 1 inch
Turret Style Capped
Adjustment Graduation 1/4 MOA
Travel Per Rotation 15 MOA
Max Elevation Adjustment 70 MOA
Max Windage Adjustment 70 MOA
Parallax Setting 100 yards
Length 11.7 inches
Weight 14.4 oz
Back to top


Back to top



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.
Back to top


Please select Reticle.
Back to top


Back to top


Rated 5 out of 5 by from Awesome Quality! I have owned and throughly abused my diamondback 3-9x40 for about 4 years; its been rained on countless times, dropped as a result of sling malfunctions, its been frozen solid in -30(-22F), and even covered in mud from being strapped onto ATV's. I am thoroughly impressed. The glass on my diamondback is clear as day, the magnification ring is smooth, and aside from exterior scratches and scuffs the scope has held up wonderfully and is always bang on when it counts. Being a student this scope was at the top of my price range but DEFINITELY worth every dime. I have nothing but good to say about it. Vortex has gained a costumer for life.
Date published: 2018-03-08
Rated 5 out of 5 by from An Awesome Scope At An Awesome Price! The Diamondback series of optics is what got me hooked on Vortex. It started with the binos and led to scopes. My 3-9x40 with v-plex reticle is currently on my muzzleloader. This scope has withstood the recoil as well as being bumped and knocked around a little in the deer woods. The clarity of glass is excellent in this price point and even better than some above. The Diamondback is a basic no frills scope that just does what it needs to do. It's clear, holds zero, has positive/repeatable adjustments, and it can take some abuse. If you want a riflescope that you can rely on for your hunt without breaking the bank then the Diamondback is your answer.
Date published: 2017-06-15
Rated 5 out of 5 by from Diamondback 3-9x40 what a great scope! I recently came across a diamondback 3-9. And went a head and pulled the trigger on it. I am so glad I did because after sighting it in and shooting with the optic what an amazing scope the quality is there and for the price what a deal! I have no complaints about the scope and the quality of it. It by far has amazed me. I for now on will always go to vortex. I only wish I would have gotten vortex before my other optics because what a difference on many levels. If you are concerned about the diamondback 3-9x40 have no worries it is so worth it! I can only imagine how vortex’s higher class scopes are.
Date published: 2018-03-07
Rated 5 out of 5 by from Great "working man" scope! I have deer hunted my whole life. I have used countless scopes by countless manufacturers. Between hunting and my job as a police officer there is not another brand i trust more than Vortex. I have a few different models specific to certain task but one of my favorites is my diamondback. For all around use it is great, clear, good in low light, durable and cost effective. A lot of folks cant afford to drop 1k$ on a scope and it sure is nice to have a scope and company that you can trust for a fraction of that price. Coming from a blue collar man that enjoys the outdoors, Vortex is who i trust.
Date published: 2017-06-15
Rated 5 out of 5 by from Exactly what it needs to be. Best scope I have owned. I run the diamondback 3 on my AR-10 in .308 running hot loads with a Nord arms muzzle break. Needless to say my optics get rattled a lot. I have gone through 3 different sets of rings trying to find something that holds up but the scope has never faltered. It has never lost its zero, is crystal clear and is useful out to 500 yards. For the price point it is hands down best on the market. This optic was my first purchase from vortex and it has secured me as a customer for life. Looking forward to picking up a vortex venom for my mark IV and a FFP Viper to improve my LRTS.
Date published: 2019-05-02
Rated 5 out of 5 by from Great Scope for the price. Bought a Vortex Diamondback 3-9X40 and put it on my Ruger M77 Hawkeye .338Win Mag about 6 years ago and it's held up great with zero issues. I've taken it on many hunts over the years and have been successful. The scope has held up great over the last 6 years in the Alaskan Backcounty.
Date published: 2018-03-01
Rated 5 out of 5 by from Small price, but doesn’t feel cheap Had this for over a year now and never had an issue. Never lost zero ever though I may have dropped it once or twice. Extremely well put together for the price range. You can’t lose with optic!
Date published: 2018-03-30
Rated 5 out of 5 by from Great Value Scope I purchased the 3-9x40 Diamondback for my Ruger American 308 rifle. I have lots of experience with other Vortex product, so I came back once again to get glass for my new Ruger. The Diamondback features a smooth adjustment ring and quality turrets that track well. Glass quality is excellent for the price level. This is one of those scopes that carries a relatively low price tag,but I know when I take it out of the box and mount it on my rifle its going to be a quality piece. On the rare chance I get a lemon, I know that Vortex's VIP warranty will take care of it. The VIP warranty is one of the things that keeps me coming back again and again and giving Vortex first shot at any of my optics needs. I have since recommended this same scope to 2 other people who have purchased to put on their hunting rifles.
Date published: 2017-06-15
  • y_2019, m_5, d_24, h_7
  • bvseo_bulk, prod_bvrr, vn_bulk_2.0.12
  • cp_1, bvpage1
  • co_hasreviews, tv_0, tr_115
  • loc_en_US, sid_DBK-3-9X40, prod, sort_[SortEntry(order=RELEVANCE, direction=DESCENDING)]
  • clientName_vortex-optics
  • bvseo_sdk, p_sdk, 3.2.1
  • CLOUD, getReviews, 6.82ms
Back to top