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Footprint: RMRDot: 2 MOA + 32 MOA circleBattery: CR1632 (side load)Window: LargeBrightness: 10 daylight + 2 NVMulti-reticle systemSide battery trayMinimal parallax shiftSlight blue lens tintButtons are small with gloves
Footprint: RMRDot: 3.25 MOABattery: CR2032 (bottom)Window: MediumHousing: Forged aluminumLegendary durabilityExcellent sealingCrisp dotBottom batterySmaller window
Footprint: RMRDot: Multi-reticleBattery: Side CR1632Housing: TitaniumExtremely durableSide batteryClear glassHeavierSlight tint
Footprint: ACRODot: 3.5 MOABattery: CR2032 (side)Design: EnclosedFully sealed emitterOutstanding battery lifeNo debris issuesRequires adapter plateSmaller window feel
Footprint: DPPDot: 2.5 MOABattery: Top CR2032Window: Very largeMassive windowTop battery accessClear glassLess rugged than RMRTaller deck height
Footprint: DocterDot: 3 MOABattery: Top CR1632Window: MediumAffordableEasy controlsTop batteryLess durableNoticeable distortion at edges
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6 Best Red Dot for Arex Delta Gen 2 in 2026: Mounting & Compatibility
The Arex Delta Gen 2 is optics-ready, but choosing the right red dot isn’t just about picking a popular model. You need to think about RMR footprint compatibility, plate systems, co-witness height, and how the optic handles recoil impulse from a relatively lightweight slide. I’ve tested and evaluated a wide range of pistol optics, and in this guide, I’ll break down the best options that actually work well on this platform.
Top Product List: Best Red Dot for Arex Delta Gen 2
Holosun 507C
The Holosun 507C is the most balanced optic I’ve used on the Arex Delta Gen 2, offering durability, flexibility, and excellent usability.
Specs:
Pros:
Cons:
My hands-on notes:
The window is forgiving during fast draws, and parallax shift is minimal even at extreme angles. Co-witness sits slightly high depending on plate choice. The emitter can get occluded by debris, but not excessively.
What people say online:
Most users praise its value and reliability, especially compared to pricier optics.
Mounting:
Direct RMR footprint—perfect with standard Arex adapter plates.
Trijicon RMR Type 2
This is still the gold standard for durability and duty use.
Specs:
Pros:
Cons:
My hands-on notes:
Virtually no zero shift under recoil. Parallax is well-controlled. Co-witness works well with suppressor sights. Button feel is excellent, even with gloves.
What people say online:
Widely trusted by law enforcement and military users.
Mounting:
Direct RMR footprint—ideal for Arex plates.
Holosun 508T
The 508T is essentially a tank version of the 507C.
Specs:
Pros:
Cons:
My hands-on notes:
Handles recoil impulse extremely well. The emitter is slightly recessed, reducing occlusion risk. Co-witness is consistent with RMR-height sights.
What people say online:
Popular among shooters who want durability without paying Aimpoint prices.
Mounting:
Direct RMR compatibility.
Aimpoint ACRO P-2
Closed emitter optics like this shine in harsh conditions.
Specs:
Pros:
Cons:
My hands-on notes:
Zero emitter occlusion. Slightly more tunnel effect than open optics. Parallax is extremely well controlled. Buttons are glove-friendly.
What people say online:
Highly trusted for duty and harsh environments.
Mounting:
Requires ACRO plate for Arex Delta Gen 2.
Leupold DeltaPoint Pro
This is my go-to for competition-style shooting.
Specs:
Pros:
Cons:
My hands-on notes:
The large window makes tracking easy. Parallax is slightly more noticeable at edges. Co-witness is higher due to deck height.
What people say online:
Loved for speed shooting and USPSA.
Mounting:
Requires DPP plate.
Vortex Venom
A solid entry-level option for casual shooters.
Specs:
Pros:
Cons:
My hands-on notes:
Button tactility is decent even with gloves. Slight lens distortion near edges. Parallax is acceptable but not class-leading.
What people say online:
Great for range use, less for duty.
Mounting:
Requires Docter/Noblex plate.
How I Tested / Evaluation Criteria
Parallax:
I evaluated parallax by shifting my eye position across the window while maintaining target focus. High-end optics like the ACRO P-2 and RMR Type 2 showed minimal shift, while budget optics exhibited more noticeable deviation at extreme angles.
Co-witness / Deck Height:
Deck height determines how easily you can co-witness iron sights. Lower deck optics like the RMR allow better lower-third co-witness, while taller optics like the DeltaPoint Pro require taller suppressor sights.
Durability:
I assessed recoil resistance, housing strength, and drop survivability. Titanium and forged aluminum housings clearly outperform polymer or thin aluminum designs.
Battery:
Battery placement matters. Side-loading designs like Holosun are far more convenient than bottom-loading optics, which require re-zeroing.
Brightness Range:
I tested visibility in bright daylight and low light. NV settings are a bonus for professional users.
Glass Quality:
Clarity, tint, and distortion were all evaluated. Slight blue tint is common but shouldn’t obscure targets.
Controls Ergonomics:
Button size and tactility matter—especially with gloves. Larger, tactile buttons are preferable.
Mounting Ecosystem:
The Arex Delta Gen 2 supports multiple footprints via plates, but RMR remains the most practical due to widespread compatibility.
How to Choose the Right Red Dot for This Gun
The Arex Delta Gen 2 sits in an interesting category—it’s compact enough for carry but large enough for duty or range use. That means your optic choice should reflect how you actually intend to use the pistol.
First, consider footprint compatibility. The most practical route is sticking with the RMR footprint because it offers the widest compatibility and the most proven options. While ACRO and DPP footprints are viable, they require dedicated plates and can complicate your setup.
Next is deck height and co-witness. If you plan to run backup iron sights, lower-profile optics like the RMR or Holosun 507C will make your life easier. Taller optics often require suppressor-height sights, which can affect concealability.
Open vs closed emitter is another key decision. Open emitters are lighter and offer larger windows, but they can suffer from emitter occlusion due to water, dust, or debris. Closed emitters like the ACRO P-2 eliminate this issue entirely but at the cost of weight and a slightly more enclosed sight picture.
You also need to think about battery access. Side-loading batteries are the most practical, especially if you don’t want to re-zero your optic every time you swap batteries. Top-loading is also acceptable, but bottom-loading is the least convenient.
Finally, consider your use case. For duty or defensive use, durability should be your top priority. For competition or range shooting, window size and speed matter more. Budget optics can work, but they often compromise on durability and long-term reliability.
FAQs
1. Does the Arex Delta Gen 2 use RMR footprint?
It supports multiple footprints via plates, but RMR is the most common.
2. Can I co-witness with factory sights?
Usually no—you’ll need suppressor-height sights.
3. Are closed emitter optics worth it?
Yes, especially for harsh environments or duty use.
4. What dot size is best?
3–6 MOA is ideal for defensive shooting; smaller dots work for precision.
5. Do I need a plate?
Yes, unless your slide is directly milled for a specific footprint.
Conclusion
Choosing the Best Red Dot for Arex Delta Gen 2 ultimately comes down to balancing durability, mounting compatibility, and how you actually use your pistol. For most shooters, the Holosun 507C hits the sweet spot, while the RMR Type 2 and ACRO P-2 dominate in hard-use scenarios.
If you prioritize speed, go with a large-window optic like the DeltaPoint Pro. If budget matters, the Vortex Venom gets you started. But if you want a reliable, proven setup that works across all conditions, sticking with an RMR-footprint optic is still the smartest move.
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