If you are looking for the best red dot sight for Arex Delta Gen 2, you are in the right place.
A high-quality red dot sight atop the Arex Delta Gen 2 improves accuracy, target acquisition speed, and overall shooting performance. This guide will help you find the perfect red dot sight to enhance your pistol’s performance and make every shot faster, precise, and more reliable.
Understanding the Arex Delta Gen 2 Optic Footprint
The Arex Delta Gen 2 comes with an optics-ready slide, designed to make adding a red dot sight simple and flexible. Unlike some pistols that use a single standard footprint, the Delta Gen 2 includes multiple adapter plates that allow you to mount a variety of popular red dot patterns. This means shooters aren’t limited to one type of optic; whether you prefer Trijicon RMR-style sights, RMSc, Shield RMS, or C-More style footprints, there is a compatible plate available.
Best Red Dot Sights for Arex Delta Gen 2
1. Holosun HE507K-GR X2
The HOLOSUN HE507K-GR X2 is the best red dot sight for Arex Delta Gen 2. It is a compact, high-performance reflex sight designed for pistols, offering a perfect balance of durability, precision, and versatility.
The green reticle provides excellent visibility in bright daylight while remaining clear in low-light conditions. The sight also features multiple reticle options, including a 2 MOA dot, a 32 MOA circle, or a combination of both, allowing users to choose what best suits their shooting style.
Its solar panel and Shake Awake technology ensure consistent power efficiency, extending battery life significantly, while the sight automatically activates when in use and goes into standby when idle.
Furthermore, this optic is constructed from titanium alloy for ultimate durability. It is also shockproof, waterproof, and rugged enough for demanding shooting conditions.
To add on durability, the compact size and low-profile design of the HE507K-GR X2 make it ideal for carry pistols, allowing for co-witnessing with iron sights without adding unnecessary bulk.
Above all, installation is straightforward thanks to its standard footprint, and the sight’s intuitive controls make brightness adjustments quick and simple.
Pros
- Durable titanium alloy construction
- Shockproof, waterproof, and rugged design
- Multiple reticle options
- Bright green reticle for high visibility
- Solar-powered with Shake Awake technology for extended battery life
- Parallax-free design for improved accuracy
- Compact and low-profile for carry pistols
Cons
- The green reticle may be less visible in certain low-light situations compared to the red reticles
2. Burris FastFire 3
The Burris FastFire 3 is a compact and versatile red dot sight designed for shooters seeking speed, reliability, and simplicity.
Its lightweight design makes it suitable for a wide range of firearms, while the 3 MOA red dot provides fast target acquisition and precise aiming in both close and medium-range engagements.
Furthermore, the FastFire 3 impresses with a clear lens and wide field of view, allowing shooters to maintain situational awareness while keeping their target in focus.
Construction-wise, its rugged aluminum housing ensures durability, while the sight remains waterproof, fog-proof, and shockproof, making it reliable in various weather and environmental conditions.
Another key advantage of the FastFire 3 is its user-friendly operation. The sight has simple controls with intuitive brightness adjustments, allowing shooters to adapt quickly to changing light conditions. Battery life is also impressive, lasting thousands of hours on a single CR1632 battery, and the auto-shutoff feature helps conserve power when not in use.
Pros
- Lightweight and compact design
- Durable, waterproof, fog-proof, and shockproof
- Clear lens and wide field of view
- Fast target acquisition with 3 MOA red dot
- Long battery life with auto-shutoff
- Simple, intuitive controls
- Easy to mount on multiple platforms
Cons
- Limited dot size options, only 3 MOA
3. Vortex Optics Defender-ST
The Vortex Optics Defender-ST Micro Dot Sight is a compact, rugged red dot designed for fast target acquisition and consistent performance in a wide range of shooting scenarios.
Its lightweight, low-profile design makes it ideal for handguns, without adding bulk or affecting balance.
Furthermore, the sight features a crisp 3 MOA red dot reticle that provides precise aiming without obstructing your field of view, ensuring rapid alignment and target tracking.
Construction-wise, it is built with a durable aluminum housing to ensure long-term durability. Additionally, the fully coated lenses offer excellent clarity, scratch resistance, and protection against recoil, shock, and harsh environmental conditions.
Whether for competition, tactical use, or casual shooting, this micro dot balances reliability with portability. Its intuitive controls and long-lasting battery life allow shooters to adjust brightness levels easily and depend on consistent performance over extended sessions.
Above all, the sight’s easy-to-mount footprint fits standard micro red dot adapters, and its tool-free adjustments make zeroing quick and straightforward.
Pros
- Compact and lightweight design
- Durable, shock-resistant aluminum housing
- Crisp 3 MOA red dot for quick target acquisition
- Easy brightness adjustments
- Tool-free windage and elevation adjustments
- Excellent lens clarity and scratch resistance
Cons
- Comparatively shorter battery life
4. Trijicon SRO Sight Adjustable LED 1.0 MOA
Carrying the renowned Trijicon name, the SRO is the best red dot sight for Arex Delta Gen 2 for rugged use.
Its standout feature is the 1.0 MOA red dot, which provides precise aiming for fast target acquisition without obstructing the field of view. The sight’s large, unobstructed lens ensures maximum situational awareness, allowing shooters to maintain focus on the target while keeping peripheral vision clear.
Moreover, the adjustable LED brightness is intuitive, offering settings suitable for bright daylight or low-light conditions. The sight also features a parallax-free design to ensure that the point of aim is accurate from multiple eye positions.
Durability is another key strength, with the SRO featuring a rugged aluminum housing that withstands recoil, drops, and harsh environments.
Another appreciated aspect of the Trijicon SRO is its battery life that reduces maintenance concerns during extended use. Installation is also straightforward thanks to its versatile mounting footprint, compatible with a wide range of pistols.
Pros
- Extremely precise 1.0 MOA red dot
- Large, unobstructed lens for better situational awareness
- Adjustable LED brightness for all lighting conditions
- Parallax-free design for accurate aiming from multiple angles
- Durable, rugged construction suitable for heavy use
- Long battery life on a single CR2032 cell
- Easy to install on various pistol platforms
Cons
- Higher price point compared to basic reflex sights
5. Ade Advanced Optics RD3‑023 Valkyrie
The Ade Advanced Optics RD3‑023 Valkyrie is a compelling budget‑friendly green dot reflex sight that gives shooters a taste of pistol optics performance without the steep price tag.
It features a crisp 4 MOA green reticle that’s easy to pick up in a variety of lighting conditions, and the compact design keeps weight low and balance tight on optics‑ready pistols.
Furthermore, the Valkyrie uses the popular RMR footprint, making it broadly compatible with many modern handguns and mounting plates. A thoughtful touch is its built‑in motion‑activated shake awake system that conserves battery life by shutting down after inactivity and instantly reactivating with movement.
Moreover, the sight also incorporates a subtle iron‑sight‑style curve with dual white dots toward the rear, offering a basic co‑witness reference that can be handy if you choose to layer sights.
Pros
- Affordable price compared with many reflex sights
- Bright, visible 4 MOA green dot suited for quick target acquisition
- Shake awake motion‑activated system extends battery life
- Lightweight and compact for minimal impact on pistol handling
- Fits standard RMR footprint for wide mounting compatibility
Cons
- Durability and long‑term reliability are modest at best
6. Leupold DeltaPoint Pro
Next, we have the Leupold DeltaPoint Pro. This is a top-tier reflex sight that has earned a strong reputation among competitive shooters and tactical enthusiasts alike.
Its standout feature is the crisp, clear 2.5 MOA red dot. This reticle offers exceptional visibility even in bright sunlight. Furthermore, the sight’s wide field of view allows for fast target acquisition, making it ideal for dynamic shooting scenarios.
Built with Leupold’s signature ruggedness, the DeltaPoint Pro is both shockproof and waterproof, ensuring reliable performance in harsh conditions. It also features a low-profile design that is streamlined for pistols, allowing for easy co-witness with iron sights and a comfortable, natural shooting stance.
Functionality is where the DeltaPoint Pro truly shines. The adjustable brightness settings provide precision in varied lighting conditions, and its parallax-free design means the point of impact stays consistent even when your eye position shifts slightly.
Moreover, installation is straightforward, with multiple mounting options that suit different platforms. The sight also includes motion-sensing technology that automatically turns it on when moved and off when idle.
Pros
- Crisp, bright 2.5 MOA red dot for fast target acquisition
- Wide field of view for situational awareness
- Rugged, shockproof, and waterproof construction
- Low-profile design suitable for pistols and rifles
- Parallax-free for consistent accuracy
Cons
- Higher price compared to other reflex sights
7. FXA12 PRO Micro Red Dot Sight for RMR/507c Footprint
The FXA12 PRO Micro Red Dot Sight is a compact, lightweight optic designed to fit the RMR and Holosun 507C footprint.
The sight impresses with its solid build quality, featuring a durable aluminum housing that withstands daily carry and occasional bumps without losing zero.
The multi-coated lens provides a clear, crisp view, and the 3 MOA red dot is bright and easily adjustable for different lighting conditions, giving quick target acquisition in both indoor and outdoor settings.
Furthermore, its low-profile design helps maintain a natural sight picture while reducing bulk, and the included mounting hardware ensures a snug fit on most RMR-compatible platforms.
During use, the FXA12 PRO proves to be reliable and user-friendly. The battery life is impressive for a micro red dot, lasting thousands of hours on a single CR2032 cell. Additionally, the intuitive controls make brightness adjustments fast, even under stress, and the optic holds zero consistently, even during repeated recoil cycles.
Overall, it combines affordability, performance, and durability in a package that rivals many higher-priced micro red dot sights.
Pros
- Durable aluminum housing resistant to daily wear
- Clear, multi-coated lens with minimal glare
- 3 MOA red dot offers fast target acquisition
- Long battery life with easy replacement
- Low-profile, lightweight design
- Holds zero reliably under recoil
- Fits both RMR and 507C footprints
Cons
- No night vision compatibility
8. OSIGHT S Multi-Reticle Micro Enclosed Sight
The OSIGHT S Multi-Reticle Micro Enclosed Sight is our last recommendation for the best red dot sight for Arex Delta Gen 2.
This is a compact and versatile red dot sight designed for RMSc footprint pistols, offering a combination of precision and durability in a small package.
Featuring a 2 MOA dot paired with a 32 MOA circle, this sight allows shooters to choose pinpoint accuracy or quick target acquisition depending on the scenario. This multi-reticle functionality is intuitive, allowing users to switch between reticle options seamlessly without compromising sight picture clarity.
Additionally, its enclosed design provides excellent protection for the optics against dust, debris, and impacts, making it ideal for both everyday carry and competitive shooting.
What’s more, the OSIGHT S comes equipped with a charging cover, enabling convenient USB recharging, eliminating the need for frequent battery replacements. The sight also delivers a crisp, bright dot with adjustable intensity, ensuring usability in varied lighting conditions.
For added convenience, the controls are straightforward, allowing even newer shooters to quickly adapt while maintaining reliable performance under rapid-fire conditions. The sight also features a lightweight build and low-profile design to minimize interference with holstering.
Pros
- Multi-reticle: 2 MOA dot + 32 MOA circle for flexible targeting
- Enclosed design protects optics from debris and impact
- USB rechargeable with included charging cover
- Adjustable brightness for various lighting conditions
- Compact and lightweight, ideal for RMSc footprint pistols
- Low-profile design for easier holstering
Cons
- Enclosed design slightly limits field of view compared to open sights
- It takes time to get used to the multi-reticle switching under stress
Read Also
Factors to Consider when Choosing the Best Red Dot Sight for Arex Delta Gen 2
Here are the key factors to consider when buying a red dot sight for the Arex Delta Gen 2.
Compatibility and Mounting
The first factor to consider is whether the red dot sight is fully compatible with the Arex Delta Gen 2. This includes ensuring the footprint and mounting system match the pistol’s slide. Some sights may require an adapter or specific mounting plate, so confirming compatibility beforehand will save time and prevent frustration during installation.
Reticle Type and Size
Red dot sights come with different reticle shapes and sizes, such as 2 MOA, 3 MOA, or larger dots. For the Arex Delta Gen 2, a smaller dot, like 2 or 3 MOA, is usually ideal for precision shooting and target acquisition. The reticle should be clearly visible against various backgrounds without obstructing your sight picture.
Battery Life and Power Source
Next, battery life is a critical factor for red dot sights, especially for pistols like the Arex Delta Gen 2, which are used occasionally or during extended shooting sessions. Look for sights that offer long-lasting batteries or rechargeable options to reduce downtime. Some models also include auto-off features to conserve power.
Durability and Build Quality
The best red dot sight for Arex Delta Gen 2 should withstand recoil, rough handling, and exposure to the elements. Consider sights made from high-quality aluminum or steel with water, shock, and dust resistance. This guarantees the sight maintains zero even after repeated use and remains functional in adverse weather conditions.
Ease of Adjustment
The ability to quickly adjust windage and elevation is essential for accurate shooting. Some sights offer tool-free adjustments or tactile clicks, which make it easier to fine-tune without additional equipment. Seniors or shooters who prefer simplicity may favor models with intuitive controls.
Optical Clarity and Lens Coating
Furthermore, clear optics are vital for rapid target acquisition. Look for red dot sights with anti-reflective coatings and wide fields of view to reduce glare and enhance visibility in different lighting conditions. The best red dot sight for Arex Delta Gen 2 should also have a crisp, bright sight picture to ensure accurate shooting without straining your eyes.
Weight and Profile
For handguns like the Arex Delta Gen 2, a lightweight and low-profile sight helps maintain balance and maneuverability. Heavy or bulky sights can alter the pistol’s handling, making rapid target transitions more difficult. A compact design is also preferable for both range and carry use.
Price and Warranty
Finally, consider the price and warranty. While high-end sights often offer better features and durability, there are reliable mid-range options that provide excellent performance. A solid warranty also ensures peace of mind in case of defects or issues with the sight.
Pros and Cons of Red Dot Sights for Arex Delta Gen 2
Pros:
- Quick target acquisition. Red dot sights allow shooters to focus on a single aiming point without aligning traditional iron sights.
- Increased accuracy and precision. The illuminated reticle provides a precise aiming point, which is beneficial at longer distances or for shooters who struggle with traditional sights.
- Lightweight and low-profile options. Many red dot sights designed for pistols are compact and lightweight. This helps maintain the Arex Delta Gen 2’s natural balance and handling characteristics.
- Long battery life or rechargeable options. Modern red dots often boast long battery life lasting tens of thousands of hours on low settings. Some even offer rechargeable batteries, eliminating the need for frequent replacements and saving money over time.
- Tool-free adjustments and intuitive controls. The best red dot sight for Arex Delta Gen 2 come with easy‑to‑use windage and elevation controls, tactile clicks, and simple adjustment tools.
- Reduce Eye Strain. Since you’re focusing on one aiming point rather than multiple iron sight planes, red dot sights are easy on the eyes during lengthy shooting sessions.
Cons:
- High-end models are expensive. While there are budget‑friendly options, the best‑performing red dot sights tend to come with a higher price tag.
- Potential for Glare on Poor Optics. Lower‑end red dot sights sometimes suffer from glare or poor lens coatings. This reduces visibility in bright sunlight or under range lights, affecting your ability to acquire the reticle quickly and clearly.
- Learning Curve for New Users. Shooters accustomed to iron sights might find red dot optics unfamiliar at first. Although they often speed up shooting once learned, there is a short adjustment period to trusting and using the reticle effectively.
Installation & Zeroing Tips
- Ensure Proper Compatibility: Confirm the red dot sight matches the Arex Delta Gen 2’s optic cut and footprint. Use the correct mounting plate or adapter and follow the manufacturer’s instructions for proper alignment.
- Secure the Optic Firmly: Tighten mounting screws evenly to keep the optic secure and prevent loss of zero. Avoid overtightening, and consider using a thread‑locking compound to stop screws from loosening.
- Initial Mechanical Zero: Center the reticle by adjusting windage and elevation before range use. This minimizes adjustments during live zeroing and saves time.
- Start Zeroing at a Short Distance: Begin zeroing at 10–15 yards to easily track shot placement. Once aligned, fine‑tune the zero at your preferred distance.
- Make Small, Consistent Adjustments: Adjust windage and elevation in small increments and fire controlled groups between changes. This prevents overcorrection and improves accuracy.
- Confirm and Recheck Zero: Fire multiple groups to confirm consistency after zeroing. Recheck the zero periodically, especially after heavy use or removing the optic.
FAQs
- Can any red dot sight fit the Arex Delta Gen 2?
No. Not all red dot sights are compatible. You need to check the footprint and mounting system and confirm it’s compatible with the handgun.
- What size reticle is best for the Arex Delta Gen 2?
A 2 MOA or 3 MOA dot is ideal. Smaller dots offer more precision for target shooting, while slightly larger dots like 6 MOA are easier to acquire quickly in dynamic situations.
- Will the sight hold zero after repeated shooting?
It depends on the build quality. High-quality red dot sights with durable construction are designed to maintain zero even after heavy recoil. Always check user reviews for real-world durability reports
Final Words
Finding the best red dot sight for Arex Delta Gen 2 means balancing performance, ease of use, and reliability. A sight that is compatible, durable, and offers clear optics will improve accuracy and make target acquisition faster and more intuitive. By considering key factors like reticle size, battery life, and mounting options, you will choose a red dot that enhances your shooting experience and ensures consistent, confident performance every time you handle your pistol.