Vortex Optics Defender-XL Micro 3 MOA Green Dot Sight - DFXL-MGD3

• Bright Green Dot: Targets quickly in varied lighting and diverse backgrounds.
• Large Viewing Window: For fast target acquisition and large field of view.
• ShockShield Polymer Insert: To protect against hard, daily abuse.
• Fast-Rack Texturing: Aggressive texturing on face of optic for racking slide off any surface.
• Motion Activation With 10 minute Auto-Shutoff: Automatically activates with motion while 10 minute auto-shutoff saves battery life.
• Button Lockout: Prevents accidental brightness adjustment during use or transport.
• Top Mount Battery: Easy battery change without having to rezero your optic.
• 10 Daylight Bright Brightness Settings: Daylight bright, illuminated center dot aids in faster center-point acquisition in bright daylight conditions.
• Night-Vision Compatibility: The lowest 2 settings are night-vision compatible.
• Parallax Free: All green 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.
• Low-Glare Matte Black Anodized: Corrosion and wear resistant anodization provides low-glare matte surface
• Single-Piece Chassis: Compact and lightweight.
• 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.
• Shockproof: Rugged construction withstands recoil and impact.

 Specifications

What our Experts Think

• Ultra-fast target acquisition – Large XL window and bright 3 MOA green dot deliver quicker sight alignment and improved peripheral awareness
• Green dot advantage – Easier to pick up in bright daylight and varied backgrounds compared to traditional red dots
• Built for speed & competition – Designed for rapid transitions and follow-up shots, ideal for competitive and defensive shooting
• Smart motion activation – Auto-on with movement and 10-minute auto shutoff maximizes readiness and battery efficiency
• Impressive battery life – Up to 25,000 hours on a CR2032 battery reduces maintenance frequency
• Rugged, recoil-ready construction – Aluminum body with ShockShield™ insert ensures durability under heavy use
• Crystal-clear optics – Aspherical lens provides a sharp, distortion-free sight picture with minimal parallax
• User-focused features – Top-loading battery (no re-zero), Fast-Rack texturing, and multiple brightness settings enhance usability

Q&A

Q: What is the Defender‑XL designed for?
A: Built for competition and defensive shooting, offering fast target acquisition with a large viewing window and lightweight micro footprint.

Q: What reticle does it use?
A: Features a 3 MOA bright green dot, ideal for quick acquisition while maintaining precision.

Q: How is the visibility and field of view?
A: The extra-large window + aspherical lens provides a wide, distortion-free sight picture for faster follow-up shots.

Q: What is the battery life and power system?
A: Runs on a CR2032 battery (top-loading) with up to 25,000 hours runtime, and no need to re-zero after replacement.

Q: Does it have motion activation?
A: Yes, motion activation + 10-minute auto shutoff helps conserve battery while staying ready.

Q: How many brightness settings are available?
A: Offers 10 daylight + 2 night-vision compatible settings for all lighting conditions.

Q: Is it durable for heavy use?
A: Yes, features aluminum housing, ShockShield™ insert, and waterproof/fogproof design for recoil and harsh environments.

Q: What mounting footprint does it use?
A: Uses the DeltaPoint Pro footprint, compatible with many slides and mounting systems.

Q: Is it parallax-free?
A: Yes, it is virtually parallax-free with unlimited eye relief, ensuring consistent accuracy.

Q: What comes in the box?
A: Includes Picatinny mount, Glock MOS plate, screws, tool, battery, lens cloth, and protective cover.

Maintenance Tips

• Clean lens carefully: Use a microfiber cloth and lens-safe cleaner to preserve clarity and the green dot’s crisp visibility.
• Keep emitter window clear: Remove dust and debris to ensure consistent dot projection and accuracy.
• Check mounting screws: Regularly verify tightness for reliable zero retention under recoil.
• Battery maintenance: Replace CR2032 as needed and remove during long-term storage to prevent leakage.
• Use proper brightness settings: Lower settings extend battery life and improve visibility in low-light conditions.
• Protect from moisture & dirt: Wipe down after exposure, even though it’s water-resistant and rugged.
• Avoid touching glass: Fingerprints can distort the dot and reduce performance.
• Minimize impacts: Durable micro design, but avoiding drops helps maintain internal alignment.