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Vortex 4-12x40 Diamondback Riflescope (Matte Black)

BH #VO12X40DBBDC • MFR #DBK-04-BDC
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Vortex 4-12x40  Diamondback Riflescope (Matte Black)
Key Features
  • 1.0" Main Tube
  • Waterproof
  • Fogproof
  • Dead-Hold BDC Reticle
Vortex is dedicated to the development and production of unique optics with features that allow you to see the world more clearly.

The Vortex 4-12x40 Diamondback is built to endure, perform, and excel. Its one-piece center-tube design is carefully constructed from 6061-T6 aluminum, and fitted with a precision adjustment system that allows for a generous amount of correction. The optical system is fully multicoated, and the entire assembly is then purged with argon gas for flawless all-weather performance.

Long-range target acquisition can be difficult, and having 4-12x magnification on tap will help get the job done in most cases. Twilight hunters will appreciate the highly efficient 40mm objective when the sun gets close to the horizon.

This Diamondback scope is configured with a 1.0" tube, an adjustable objective, 1/4 MOA adjustments with 66 MOA of travel, low-profile turrets, a Dead-Hold BDC reticle, and a matte black finish.

A mounting base and rings are used to attach a riflescope to a firearm. A comfortable sight picture is contingent upon the height of the rings. A comfortable cheek-weld is the result of properly positioning the scope over the receiver. Mounting the scope close to the receiver is preferable, yet scopes with larger objectives need higher rings so the front bell can clear the barrel. It should be noted that in many mounting applications, a professional gunsmith's skills will be needed for proper installation.

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Vortex Diamondback 4-12x40 Overview

Vortex is dedicated to the development and production of unique optics with features that allow you to see the world more clearly.

The Vortex 4-12x40 Diamondback is built to endure, perform, and excel. Its one-piece center-tube design is carefully constructed from 6061-T6 aluminum, and fitted with a precision adjustment system that allows for a generous amount of correction. The optical system is fully multicoated, and the entire assembly is then purged with argon gas for flawless all-weather performance.

Long-range target acquisition can be difficult, and having 4-12x magnification on tap will help get the job done in most cases. Twilight hunters will appreciate the highly efficient 40mm objective when the sun gets close to the horizon.

This Diamondback scope is configured with a 1.0" tube, an adjustable objective, 1/4 MOA adjustments with 66 MOA of travel, low-profile turrets, a Dead-Hold BDC reticle, and a matte black finish.

A mounting base and rings are used to attach a riflescope to a firearm. A comfortable sight picture is contingent upon the height of the rings. A comfortable cheek-weld is the result of properly positioning the scope over the receiver. Mounting the scope close to the receiver is preferable, yet scopes with larger objectives need higher rings so the front bell can clear the barrel. It should be noted that in many mounting applications, a professional gunsmith's skills will be needed for proper installation.

1.0" One-piece aluminum main tube construction
Parallax correction is factory preset at 100 yd
1/4 MOA W&E correction with 66 MOA of adjustment
Fast focus eyepiece for rapid target acquisition
Multi-layer XR coatings deliver edge-to-edge clarity
Unity-pressure argon purging protects against the elements at any elevation
Precision-Glide erector system provides exceptional resistance to stress cracking, temperature change, corrosion, and friction-induced wear.
Dead-Hold BDC Reticle in the Second Focal Plane
The Dead-Hold BDC reticle features four thin posts and cross hairs. The larger gate is designed to accommodate hold over points upon the 6 o'clock stadia.
Second focal plane (non-magnifying) placement of the reticle maintains its size throughout the magnification range.
UPC: 875874001152

Vortex Diamondback 4-12x40 Specs

Key Specs
Magnification
4 to 12x
Objective Lens Diameter
40 mm
Reticle Type
Reticle Type: Dead-Hold BDC Non-Illuminated
Mounting
Mounting Hardware Not Included
Optics
Magnification
4 to 12x
Objective Lens Diameter
40 mm
Exit Pupil Diameter
4x: 10 mm
12x: 3.3 mm
Eye Relief
3.3 to 3.6" / 84 to 91 mm
Field of View
4x: 32.5' / 10.8 m @ 100 m
12x: 114.5' / 38 m @ 100 m
Maintube Diameter
1"
Fogproof
Yes
Reticle
Reticle Type
Reticle Type: Dead-Hold BDC Non-Illuminated
Adjustments
Impact Point Correction
66 MOA (Windage & Elevation)
Adjustment per Click: 1/4 MOA
Environmental
Environmental Resistance
Water-Resistant (Unrated)
General
Mounting
Mounting Hardware Not Included
Dimensions
12.2" / 31 cm
Weight
14.6 oz / 414 g
Packaging Info
Package Weight
1.32 lb
Box Dimensions (LxWxH)
13.45 x 3.45 x 2.55"

Vortex Diamondback 4-12x40 Reviews

The only reason I didn’t

By Anthony S.
Rated 4 out of 5
Date: 2026-11-05

The only reason I didn’t give 5 stars for this scope is the glass gets blurry on 12x. This parallax is common but it is irritating.

Exactly what I've come to expect from the Vortex brand

By Matt A.
Rated 5 out of 5
Date: 2026-11-01

Great scope that mounted easily and quickly found zero. Paired with the precision rings, it mounted quickly to the rifle's picatinny rail and has been true for the shots it took to zero the rifle. The adjustment clicks are a little soft, but they seem to be true and consistent. Seems to be a great scope at the price point, and I'm excited to use this rifle to teach a mentored youth.

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