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Questions & Answers
Will I need an adapter plate to mount to an Sig P320X Full? Expert Answer

No, the Vortex Defender-ST will mount directly to your optic ready slide without the need for an adapter plate.

by Ethan, Gear Expert, May 22, 2025
Does this model have.. dot in a donut..?..or just red dot..?? Manufacturer Answer

This is a single dot!

by Vortex, Manufacturer, May 15, 2025
Customer Reviews
Helpful Positive Review Vortex Is the New King of Micro/Mini Red Dots. by tieurshoeonthe5thofjune, November 28, 2024
Long story somewhat short, I have tried many, many red dots in the past couple of years. Trying the Likes of Swamp Fox, Vortex (Viper/Venom), SIG, , Trijicon, and Holosun. From my personal experience as well as vast amounts of research on how well ea...
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4/5 found this helpful
Helpful Positive Review it's okay i guess by panzos, Verified Owner, March 6, 2024
Well it's okay I guess it works this the product itself is nothing wrong with it it's not defective it works well I put it on my gun for a week I tried it this is just a personal preference I don't like it I don't like it because I don't like the way...
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8/97 found this helpful
Helpful Positive Review Perfect Fit by Kevin Bisson, Verified Owner, May 12, 2025
Was looking for a direct mount dot to fit my Sig P226 Xfive STAS and it's is perfect. Dot is crisp. The red dot feels very durable and handles the recoil with zero issue. Comes wither all the screws you can think of and the 1913 mount which is amazin...
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2/2 found this helpful
Helpful Positive Review Exactly what I need by Chucky Chuck, Verified Owner, March 4, 2025
This is an excellent red dot this was everything I needed fits perfect and also has every screw. You may ever need nice large window and a real clean and crisp dot vortex really stepped it up with these
3/3 found this helpful
Helpful Positive Review Vortex Defender-ST by SkyBuster, Verified Owner, December 20, 2024
Installation on Springfield Armory 9mm Echelon very easy. Elevation and windage adjustments require a small screwdriver. Large field of view but red dot is very low in the view when co-witnessed to standard iron sights. Would be centered in field of ...
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4/4 found this helpful
Helpful Positive Review Vortex sight by X, Verified Owner, January 22, 2025
Nice field of view and adjustability. Mounted on a browning buckmark.
1/1 found this helpful
Read All 62 Reviews
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Product Info for Vortex Defender-ST 1x23mm Reflex Red Dot Sight

Handguns. Shotguns. Offset on a carbine. Whether running drills at the range or holding the line during rigorous duty use, the all-purpose Defender-ST delivers the toughness, accuracy, and adaptability your challenging world demands.image

Specifications for Vortex Defender-ST 1x23mm Reflex Red Dot Sight:

Manufacturer: Vortex
Magnification: 1 x
Illumination Color: Red
Eye Relief: Unlimited
Adjustment Type: MOA
Emitter Type: Open
Battery Type: Lithium Metal, CR2032
Red Dot Sights-Footprint: Deltapoint Pro

Features of Vortex Defender-ST 1x23mm Reflex Red Dot Sight

  • Large Hard Coated Aspherical Lens.Large Distortion Free Sight Picture
  • Motion Activation With 10 minute Auto-Shutoff. Automatically activates with motion while 10 minute auto-shutoff saves battery life
  • ShockShield. Polymer insert absorbs shock to the 7075 aluminum body protecting it for everyday abuse
  • Fast-Rack Texturing. Aggressive texturing on face of optic for racking slide off any surface
  • Top Mount Battery. Easy battery change without having to rezero your optic
  • 10 Daylight Bright Brightness Settings. 10 Daylight Bright Brightness Settings
  • Parallax Free. All red dot and holographic sights will exhibit some small amount of parallax. Matching current industry practice, this small amount would be considered "parallax free" and will make a negligible difference in performance.
  • Unlimited Eye Relief. Non-critical eye relief for rapid target acquisition
  • Night-Vision Compatibility. The lowest 2 settings are night-vision compatible.
  • Waterproof. O-ring seals prevent moisture, dust and debris from penetrating for reliable performance in all environments.
  • Fogproof. Designed to withstand a wide range of temperatures.
  • Low-Glare Matte Black Anodized. Corrosion and wear resistant anodization provides low-glare matte surface and helps camouflage the shooter's position.
  • Single-Piece Chassis. Compact and lightweight.

Package Contents:

  • Vortex Defender-ST 1x23mm Reflex Red Dot Sight
  • Glock MOS Adapter Plate
  • Picatinny Mount
  • Rubber Cover
  • Lens Cloth
  • CR2032 Battery
  • Custom Tool
  • Most Common Mounting Screw Sets

Vortex Defender-ST 1x23mm Reflex Red Dot Sight Orderable Models

List of Orderable Models

Vortex Optics OPMOD Defender-ST 1x Reflex Micro Red Dot, 6 MOA Dot, Tan, 843829145855 , MPN: DFST-MRD6-OP-KIT2023 , UPC: 4292050 , Code: VX-RD-VOR0116-DFST-MRD6-OP-KIT2023
Vortex Defender-ST 3 MOA Red Dot Sight, Black, 1.8in, 1.48oz, DFST-MRD3 , MPN: DFST-MRD3 , UPC: 843829133296 , Code: VX-RD-VOR0116-DFST-MRD3
Vortex Defender-ST 6 MOA Red Dot Sight, Black, 1.8in, 1.48oz, DFST-MRD6 , MPN: DFST-MRD6 , UPC: 843829133302 , Code: VX-RD-VOR0116-DFST-MRD6
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