The Vortex DiamondBack Tactical 4-12×40 VMR-1 MOA is a variable power riflescope with a first focal plane MOA reticle designed for tactical and precision shooting at mid-range distances.
The 4-12x magnification range balances close-range speed and longer-distance precision. The VMR-1 MOA reticle uses hash marks calibrated in minutes of angle, so your holdovers stay true at any magnification level.
This scope suits precision rifle shooters who dial or hold for elevation and windage using MOA measurements.
Key Facts
Brand: Vortex
Model: DiamondBack Tactical DBK-10025
Magnification: 4-12x
Objective Lens: 40mm
Reticle: VMR-1 MOA
What the VMR-1 MOA Reticle Offers
The VMR-1 MOA reticle sits in the first focal plane. That means the reticle scales with magnification. When you zoom in, the hash marks grow with your target, and your holdover calculations stay accurate across the entire power range.
MOA hash marks let you measure target size, estimate range, and dial or hold corrections in the same unit of measure most precision turrets use. If your dope says hold two minutes right and one minute up, you count the marks and hold.
This reticle style works well for shooters who run ballistic apps or printed dope cards and want a clean, uncluttered sight picture with enough reference points to hold wind and elevation without dialing every shot.
Who This Scope Is Built For
The Vortex DiamondBack Tactical 4-12×40 bridges the gap between a dedicated close-range optic and a high-magnification long-range rig. The lower end of the magnification range keeps both eyes open viable for faster target acquisition inside two hundred yards. The top end gives you enough detail for precise holds and clean trigger breaks on small targets.
Precision rifle competitors, hunters glassing and shooting from the same position, and tactical shooters working unknown-distance drills all find this magnification band useful. If you shoot one gun from fifty yards to five hundred, a 4-12x scope keeps you in the fight at both ends.
Looking for other magnification ranges or reticle styles? Browse our full riflescopes selection.
Mounting and Ring Selection
The DiamondBack Tactical uses a one-inch main tube. Your scope rings must match that tube diameter or the scope will not lock down properly. Ring height depends on your rifle’s action height, rail or base height, and whether you need clearance for flip-up iron sights or a large objective bell.
A 40mm objective is relatively compact, so medium-height rings work on most bolt-action and AR-platform rifles. If your rail sits high or you prefer a heads-up cheek weld, low rings may not give you enough eye relief or proper head position. Send us a message to confirm ring height and footprint before you order.
Ordering from Western Sport
Order online and it ships straight to your door. Western Sport has been a licensed FFL/SOT dealer since 2007, and everything we sell carries the full manufacturer warranty. Questions before you order? Send us a message.
Frequently Asked Questions
Q: What is the magnification range on the Vortex DiamondBack Tactical 4-12×40?
A: The magnification range is 4-12x. At four power you get a wider field of view for closer targets. At twelve power you get finer detail for precision holds at distance.
Q: Is the VMR-1 reticle in MOA or MRAD?
A: The VMR-1 reticle on this model is calibrated in MOA. Hash marks and holdover points use minute-of-angle spacing, not milliradians.
Q: What size scope rings do I need for the DiamondBack Tactical?
A: You need one-inch diameter scope rings. Ring height depends on your rifle’s action and rail setup. Send us a message if you need help choosing the correct height.
Q: Does this scope have a first or second focal plane reticle?
A: The VMR-1 MOA reticle is first focal plane. The reticle scales with your magnification, so your holdovers stay accurate at any power setting.
Q: Can I use this scope on an AR-15 platform rifle?
A: Yes. The DiamondBack Tactical 4-12×40 mounts to any rifle with a Picatinny or Weaver rail and one-inch rings. It pairs well with AR-15 builds used for precision shooting, three-gun competition, or varmint hunting.
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