A red dot is a type of non-magnified optical sight commonly used on firearms to help shooters aim more quickly and accurately. Instead of using traditional iron sights, a red dot projects a small illuminated red (or sometimes green) dot onto a glass lens aligned with the barrel of the gun. The shooter simply places this dot over the target to aim.
Key Features of a Red Dot Sight:
- Fast target acquisition: No need to align front and rear sights—just put the dot on the target and shoot.
- Parallax-free design: The dot stays on target even if your head or eye shifts slightly.
- Unlimited eye relief: You can mount it at various distances from your eye, making it flexible for different shooting styles.
- Battery-powered reticle: Most red dots run on batteries and may include brightness settings for different lighting conditions.
Common Uses:
- Handguns (like the Sig P320 DH3)
- Rifles and carbines
- Shotguns
- Tactical and competitive shooting
- Home defense and law enforcement
What Sig P320 DH3?.
The Sig Sauer P320 DH3 is a performance-driven handgun designed in collaboration with professional shooter Daniel Horner. As a part of the P320 series, the DH3 model is tailored for competitive shooting and tactical use, featuring a flat-faced trigger, aggressive slide serrations, and an optics-ready slide cut for red dot compatibility. Chambered in 9mm and built with a full-size polymer frame, the P320 DH3 blends precision, speed, and reliability, making it a top-tier option for serious marksmen.
To get the most out of this elite handgun, pairing it with the right red dot sight is essential. The best red dot for the Sig P320 DH3 should enhance target acquisition, maintain zero under recoil, and be rugged enough for both competition and defensive scenarios. Whether you’re shooting steel at speed or training for real-world engagements, a quality red dot will elevate the DH3’s already exceptional capabilities.
why use a red dot on Sig 320 DH3?
1. Faster Target Acquisition
The Sig P320 DH3 is built for speed, and a red dot allows you to capitalize on that by eliminating the need to align front and rear sights. Just place the dot on your target and shoot—no lining up required.
2. Improved Accuracy at Distance
A red dot helps you maintain a precise point of aim, especially at longer ranges. This is particularly beneficial in competition or tactical situations where consistent shot placement matters.
3. Both-Eyes-Open Shooting
Red dots promote situational awareness. With both eyes open, you can maintain a wide field of view while still staying on target—ideal for defensive or dynamic shooting scenarios.
4. Perfect Fit for the Optics-Ready Slide
The DH3 model comes with a slide cut specifically for red dots. That means no additional modification is needed—just mount your preferred optic directly to the slide.
5. Maximizes the Gun’s Competitive Edge
The P320 DH3 is a performance pistol inspired by pro shooter Daniel Horner. Pairing it with a red dot matches its design intention: fast, accurate, high-level shooting.
7 Best Red Dot for Sig P320 DH3
1.Vortex Viper Red Dot
Finding the right red dot for your handgun can dramatically improve your shooting speed and confidence—especially when every fraction of a second counts. The Vortex Viper Red Dot is purpose-built for shooters who demand precision and quick target acquisition in a compact package. Whether you’re running drills on the range, competing in a match, or carrying your pistol for self-defense, the Viper delivers solid performance without unnecessary bulk. Its ultra-low profile makes it a natural fit for optics-ready pistols like the Sig P320 DH3, allowing for co-witnessing with standard-height iron sights while maintaining an unobstructed field of view.
This sight is tailored for those who prefer a minimalist design that doesn’t compromise on ruggedness, clarity, or ease of use. Vortex has packed this optic with all the essential features—tough construction, clear glass, intuitive controls, and a bright 6 MOA dot—while backing it with their industry-best VIP Warranty. If you’re looking for a reliable, no-fuss red dot that thrives in high-stress environments, the Viper is more than up to the task.
Product Features
1. Super Low-Profile Design
The Viper’s ultra-slim body hugs your slide tightly, minimizing bulk and enabling a clean fit in optics-ready pistols. Its design makes it one of the best red dots for co-witnessing with backup iron sights—perfect for shooters who prefer a dual-sight setup.
2. 6 MOA Red Dot Reticle
A bold 6 MOA red dot ensures quick visibility, helping you acquire your target fast under stress or in motion. It’s ideal for close-to-mid-range engagements where speed is more critical than pinpoint precision.
3. Precision Adjustments
The Viper features 1 MOA windage and elevation adjustments, which are sleek, tactile, and easy to manipulate. Zeroing the optic is straightforward and holds under repeated recoil.
4. Clear Sight Picture with Armortek Protection
Vortex’s fully multi-coated, ultra-clear lens provides a wide, crisp, and unobstructed field of view. The Armortek coating shields the lens from oil, debris, and scratches, making it reliable for use in the field or on the range.
5. Easy-to-Use Controls
Power and brightness settings are simple to access and intuitive to adjust—even while wearing gloves. You can dial in your preferred brightness level quickly without disrupting your grip or focus.
6. Rugged, All-Weather Construction
Waterproof and shockproof, the Viper is built to survive harsh environments and rough handling. Whether you’re running drills or braving tough outdoor conditions, this optic is made to keep performing.
7. VIP Lifetime Warranty
The Viper Red Dot is backed by Vortex’s VIP Warranty—a fully transferable, no-questions-asked promise to repair or replace your optic if it fails due to defects or damage during normal use. While cosmetic damage and theft aren’t covered, the core promise offers exceptional peace of mind.
Pros
- Ultra-low profile ideal for optics-ready pistols
- Bright 6 MOA dot for fast target acquisition
- Fully multi-coated lens with Armortek protection
- Waterproof and shockproof durability
- Backed by a lifetime, unconditional warranty
Cons
- Lacks auto-shutoff or shake-awake features
2.Swampfox Justice 1×27
The Swampfox Justice 1×27 Red Dot Sight is built for shooters who demand speed, durability, and a clear field of view—all in a lightweight, affordable package. Designed for both handguns and shotguns, this optic features a generous 27mm objective lens, allowing for quicker target acquisition and easier tracking in dynamic shooting environments. Whether you’re hunting, competing, or practicing at the range, the Justice delivers reliable performance with a crisp red dot and rugged construction.
Product Features
1. Wide 27mm Objective Lens
The standout feature of the Swampfox Justice is its extra-large 27mm window, which offers a significantly wider field of view than many compact red dots. This makes it easier to stay on target during fast-paced shooting, follow moving game, or transition between targets.
2. Lightweight Yet Durable Design
Weighing just 0.17 kg (6 oz), the Justice red dot sight is crafted from high-grade aluminum, giving it the strength to handle recoil without weighing your firearm down. It’s ideal for handguns with optics-ready slides or shotguns using a Picatinny rail.
3. 1x Magnification for Both-Eyes-Open Shooting
The true 1x magnification enables shooters to aim with both eyes open, which improves situational awareness—especially useful during tactical shooting or while tracking game in the field.
4. Crisp Red Dot Reticle
Designed for quick visibility in any lighting condition, the red dot is easy to pick up and perfect for close to medium-range engagements. Whether you’re using it in broad daylight or low light, the Justice keeps your point of aim sharp and intuitive.
5. Versatile Mounting Compatibility
The Picatinny mounting system allows for quick and secure attachment to a wide range of firearms, from pistols like the Sig P320 DH3 to hunting shotguns. It’s a flexible option for shooters who like to move optics between platforms.
Key Specifications
- Brand: Swampfox
- Color: Red
- Objective Lens Diameter: 27mm
- Magnification: 1x (non-magnified)
- Material: Aluminum
- Item Weight: 0.17 kg (6 oz)
- Compatible Devices: Handguns, Shotguns
- Mounting Type: Picatinny
Pros
- Large 27mm window for enhanced field of view
- Lightweight aluminum build offers durability without bulk
- Crisp red dot for fast, accurate aiming
- Ideal for handguns and shotguns alike
- Easy-to-mount Picatinny system
Cons
- Larger window may be more exposed to potential impact
3.Holosun EPS Carry Red Dot
The Holosun EPS Carry-GR-2 is a compact, enclosed green dot sight built specifically for today’s narrow, optics-ready subcompact handguns. Engineered for concealed carry and everyday reliability, this reflex sight offers a rugged aluminum housing, ultra-clear aspheric glass, and a super-efficient green 2 MOA dot that excels in both daylight and low-light conditions. Whether mounted on a P365 XL, Glock 48 MOS, Hellcat, or similar EDC pistol, the EPS Carry delivers fast, precise aiming without compromising your firearm’s slim profile.
The Holosun EPS Carry-GR-2 is an outstanding optic for those who carry daily and want the performance of a full-sized red dot in a compact, durable package. With its rugged construction, ultra-low profile, and reliable green dot clarity, it’s one of the best concealed-carry-ready red dots on the market today.
Product Features
1. Optimized for Subcompact Pistols
Designed with a low deck height and narrow width, the EPS Carry fits flush on slim handguns. It even allows co-witnessing with most factory iron sights, thanks to its ultra-low mounting profile. A built-in rear notch sight further enhances its backup sighting capability.
2. 2 MOA Green Dot with Long Battery Life
The sight features Holosun’s 540nm Super Green LED, offering a crisp 2 MOA dot for fast, accurate targeting. Powered by a CR1620 battery, it boasts an impressive 50,000-hour battery life, so you won’t have to worry about frequent battery changes.
3. Shake Awake Technology
To preserve battery life, Holosun includes its trusted Shake Awake feature, which puts the sight to sleep when idle and reactivates it instantly when motion is detected. You can customize the idle time from 10 minutes up to 12 hours—or disable it entirely if desired.
4. Multilayer Reflective Glass
The EPS Carry uses an aspheric lens with multilayer coatings to maximize light transmission while minimizing distortion and glare. The result is a crystal-clear sight picture that performs well in various lighting conditions, without straining your battery.
5. Durable and Compatible Construction
Built from 7075 T6 aluminum, the EPS Carry is both strong and lightweight. It comes with a RMSc-to-K footprint adapter plate, allowing it to mount easily to a wide range of subcompact pistols. Whether you’re using factory MOS slides or custom cuts, compatibility won’t be an issue.
Key Specifications
- Reticle: 2 MOA Green Dot
- Light Wavelength: 540nm
- Magnification: 1x (Parallax Free)
- Window Size: 0.58 x 0.77 inches
- Battery Type: CR1620
- Battery Life: Up to 50,000 hours
- Brightness Settings: 10 Daylight & 2 Night Vision
- Material: 7075 T6 Aluminum
- Adjustment per Click: 1.5 MOA
- W&E Travel Range: ±30 MOA
- Mounting: RMSc-to-K Adapter Plate included
Pros
- Ultra-compact and optimized for subcompacts like P365, G43X, and Hellcat
- Crisp and efficient green 2 MOA dot with excellent battery life
- Enclosed emitter keeps dust and moisture out
- Shake Awake for battery conservation and readiness
- Durable 7075 aluminum housing with built-in rear sight
Cons
- Requires CR1620 battery, which may not be as common as CR2032
4.Aimpoint ACRO P-2
The Aimpoint ACRO P-2 is one of the most rugged, enclosed red dot sights available today—designed specifically for professional use in harsh environments. Compact yet robust, this optic offers a 3.5 MOA red dot, exceptional battery life, and full submersion capability, making it ideal for law enforcement, military, and defensive handgun applications. Its fully enclosed emitter sets it apart from open-style red dots, delivering superior protection against water, mud, and debris—no matter the mission.
The Aimpoint ACRO P-2 is a professional-grade red dot sight built for those who need reliability in the most unforgiving conditions. Whether you’re in law enforcement, the military, or a civilian who demands the best for concealed carry or home defense, the ACRO P-2 delivers rugged performance, long-term durability, and consistent accuracy you can count on—rain, snow, or combat.
Product Features
1. Crisp 3.5 MOA Red Dot
The ACRO P-2 features a clean, highly visible 3.5 MOA red dot that’s easy to pick up in both bright daylight and low-light conditions. It offers fast target acquisition while maintaining enough precision for accurate follow-up shots, whether mounted on a handgun or a carbine.
2. Extended Battery Life
Powered by a CR2032 battery (included), the ACRO P-2 provides an impressive 50,000 hours of continuous use—over 5 years of constant runtime. It’s a true “install-and-forget” optic, making it ideal for duty use and home defense where failure is not an option.
3. Ultra-Rugged Enclosed Design
Unlike open red dots, the fully enclosed emitter ensures the reticle stays visible even in rain, snow, dust, or mud. This makes the ACRO P-2 a favorite among users who operate in unpredictable and extreme environments.
4. Low-Profile and Versatile
Engineered for use on pistols, carbines, shotguns, and even magnifiers, the ACRO P-2’s low-profile design reduces snag risk and fits neatly on slim slide cuts. It integrates well into duty holsters and co-witnesses cleanly with many backup iron sights.
5. Waterproof to 115 Feet
This red dot is submersible up to 115 feet (35 meters), far beyond typical water resistance standards. Whether you’re caught in torrential rain or submerged in water, the ACRO P-2 continues to function without compromise.
6. Accessories Included
Each unit comes with a CR2032 battery and an Aimpoint T10 tool for simple mounting and adjustment right out of the box—no need to buy anything extra to get started.
Key Specifications
- Dot Size: 3.5 MOA
- Battery Life: 50,000 hours (CR2032 battery included)
- Housing: Fully enclosed emitter design
- Submersion Rating: Waterproof to 115 feet (35 meters)
- Optimized For: Low-profile red dot applications
- Included Accessories: CR2032 battery, Aimpoint T10 tool
Pros
- Fully enclosed, sealed emitter for unmatched environmental protection
- Excellent battery life—over 5 years of continuous use
- Crisp 3.5 MOA dot balances speed and precision
- Extremely durable and waterproof to 115 feet
- Compact and low-profile—great for handguns and carbines
Cons
- Higher price point than many competitors
5. SIG Sauer ROMEO2
The SIG Sauer ROMEO2 is a cutting-edge red dot reflex sight engineered for shooters who demand uncompromising performance, durability, and adaptability in any environment. Designed specifically to thrive in adverse conditions, the ROMEO2 combines a rugged construction with intelligent technology to deliver superior reliability, battery efficiency, and target acquisition speed. Whether you’re operating in rain, dust, extreme cold, or intense heat, this optic is built to go the distance—and survive the fight.
The SIG Sauer ROMEO2 is more than just a red dot—it’s a mission-ready optic built to withstand the toughest conditions while delivering intelligent performance enhancements like MOTAC and MAGNETAC. For law enforcement professionals, competitive shooters, or serious gun owners looking for a battle-proven red dot with modular protection and high-tech features, the ROMEO2 stands in a class of its own.
Product Features
1. Precision Glass & Clear Sight Picture
At the heart of the ROMEO2 is a molded aspherical glass lens that offers a distortion-free, crystal-clear view. Combined with a high-efficiency point-source LED emitter and red notch reflector coating, the sight produces exceptional light transmission and dot clarity for faster and more precise targeting—even in challenging lighting conditions.
2. Military-Grade Durability
Crafted from 7075-T6 aluminum and reinforced with ruggedized steel shrouds, the ROMEO2 is built to absorb serious impact. It includes two interchangeable shrouds, allowing users to configure the optic in three different ways: open, partially enclosed, or fully enclosed with a polycarbonate rear window for maximum environmental protection. It’s a true workhorse for duty or defense.
3. MOTAC – Motion Activated Illumination
The ROMEO2 features MOTAC (Motion Activated Illumination), which powers the dot on instantly when motion is detected and turns it off when idle. This not only ensures readiness at all times but significantly extends battery life by conserving energy during inactivity.
4. MAGNETAC – Holster-Activated Power Management
One of the most innovative features is MAGNETAC, which works with a compatible holster containing a Neodymium magnet. When holstered, the optic powers off automatically. As soon as the firearm is drawn, it reactivates to the last brightness setting—giving you instant readiness without fumbling for controls.
5. Multiple Reticle and Brightness Options
The ROMEO2 is available with your choice of 3 MOA dot, 6 MOA dot, or Circle-Dot reticles, offering shooters versatility based on their preferred shooting style. It also includes 15 brightness settings (12 for daylight, 3 for night vision) to ensure visibility in virtually any lighting condition.
6. Waterproof and Weather-Resistant
Rated IPX-7 waterproof, the ROMEO2 can be fully submerged in water up to 1 meter and still function flawlessly. This makes it a reliable option for shooters operating in wet, muddy, or snowy conditions.
Key Specifications
- Reticle Options: 3 MOA Dot, 6 MOA Dot, Circle-Dot
- Brightness Settings: 15 total (12 daylight, 3 NV)
- Housing: 7075 Aluminum with steel shroud options
- Lens: Molded aspherical glass with red notch reflector
- Illumination Activation: MOTAC and MAGNETAC systems
- Battery Life: Extended through smart power-saving features
- Waterproof Rating: IPX-7 (submersible up to 1 meter)
- Mounting Options: Configurable with open or enclosed shrouds
Pros
- Incredibly durable construction with configurable steel shrouds
- MOTAC and MAGNETAC systems offer smart, hands-free power management
- Multiple reticle and brightness settings for any environment
- Clear, distortion-free optics for fast, precise shooting
- Fully waterproof and combat-ready design
Cons
- Larger size may not suit ultra-compact pistols
6.Holosun HS507C X2
The Holosun HS507C X2 is a premium green dot reflex sight built for full-sized pistol platforms. Designed with advanced features, this optic combines durability, long-lasting power, and lightning-fast target acquisition. Whether you’re a competition shooter or a defensive firearm user, the HS507C X2 offers an intelligent and versatile aiming solution.
Enhanced Performance Features
This reflex sight utilizes Holosun’s high-efficiency Green Super LED, delivering a crisp 2 MOA dot surrounded by a 32 MOA circle. It comes with Multi-Reticle System (MRS) functionality, allowing you to toggle between three reticle options depending on your shooting environment. The 7075 T6 aluminum housing ensures strength while keeping the sight lightweight and rugged enough for everyday use.
What sets the HS507C X2 apart is its Shake Awake Technology, which powers down the LED after a user-defined period of inactivity and reactivates instantly upon motion. This dramatically extends the battery life—up to 50,000 hours—while ensuring readiness. In the event of a dead battery, the Solar Failsafe feature automatically powers the sight using ambient light, keeping you in the fight.
User-Friendly and Adaptable
The sight includes Lock Mode to prevent accidental changes in settings during carry or use. The side-loading CR1632 battery tray allows for battery swaps without unmounting the optic. With 10 daylight and 2 night vision-compatible brightness levels, the HS507C X2 adapts to nearly any lighting condition. A parallax-free optical design and unlimited eye relief further support rapid target engagement.
Key Specifications
- Reticle: Green 2 MOA Dot & 32 MOA Circle (MRS)
- Magnification: 1x
- Brightness Settings: 10 DL & 2 NV
- Power Source: Solar & CR1632 Battery (50,000 hours)
- Housing: 7075 T6 Aluminum with Anodized Finish
- Window Size: 0.63 x 0.91 inches
- Adjustment Clicks: 1 MOA
- W&E Travel Range: ±50 MOA
- Includes: T10 L Key, Battery, Lens Cloth, User Manual
Pros
- Solar backup with auto-brightness adjustment
- Long battery life with Shake Awake
- Multiple reticle options for flexibility
- Durable, lightweight aluminum construction
- Lock Mode prevents accidental button presses
Cons
- Slightly bulkier than enclosed emitter models
7.Leupold DeltaPoint Pro
When precision, ruggedness, and optical clarity are non-negotiable, the Leupold DeltaPoint Pro stands tall as a go-to red dot sight for professionals and serious shooters. Model #175840 in a sleek Dark Earth finish features a 2.5 MOA dot that’s well-suited for both speed and precision. Whether you’re mounting it on a pistol, shotgun, or rifle, this optic offers the performance needed in both tactical and hunting environments.
Professional-Grade Optical Performance
At the heart of the DeltaPoint Pro is Leupold’s Professional-Grade Red Dot Optical System. This system is engineered for maximum light transmission, providing outstanding clarity in low-light scenarios such as dusk or dawn. You also benefit from industry-leading glare reduction, which ensures a sharp, clear image even in bright, direct sunlight—an edge that professional guides and tactical users demand. The optic’s illuminated reticle makes target acquisition quicker and more accurate in dark or shadowed environments.
Intelligent Power Management
A standout feature is Motion Sensor Technology (MST), which preserves battery life by shutting off the illumination after five minutes of inactivity and instantly reactivating when movement is detected. This ensures the optic is always ready without wasting power—ideal for concealed carry or on-duty use. This energy-efficient system is paired with reliable electronics that are field-proven and trustworthy under harsh conditions.
American-Made Durability
Proudly designed, machined, and assembled in the USA, the DeltaPoint Pro is built for serious abuse. It’s 100% waterproof, fogproof, and shockproof, ensuring operational integrity in the worst environmental conditions. Whether you’re facing rain, extreme temperatures, or recoil-heavy calibers, this optic won’t let you down. Leupold backs the product with legendary customer care, offering peace of mind and top-tier service.
Key Specifications
- Model: 175840
- Reticle: 2.5 MOA Red Dot
- Finish: Dark Earth
- Optical System: Leupold Professional-Grade Red Dot
- Battery Management: Motion Sensor Technology (MST)
- Construction: Waterproof, Fogproof, Shockproof
- Origin: Designed, Machined, and Assembled in the USA
Pros
- Superior light transmission and glare control
- Auto-on Motion Sensor Technology for extended battery life
- Clear and crisp 2.5 MOA dot for versatile shooting applications
- Durable build with full environmental protection
- Sleek Dark Earth finish for tactical styling
Cons
- Slightly larger footprint compared to some compact red dots
Also Read: 7 Best Red Dots for Beretta A300 Ultima Patrol
Factors to consider when choosing Best Red Dot for Sig P320 DH3
1. Footprint Compatibility
The Sig P320 DH3 is optics-ready, but it’s essential to choose a red dot sight that matches the mounting footprint (such as DeltaPoint Pro, RMR, or Shield RMSc). Verify if your P320 slide has a specific cut or comes with adapter plates.
2. Reticle Size and Type
Look for a reticle size that suits your shooting needs:
- 2-3.5 MOA dots are great for precision shooting.
- Larger dots (e.g., 6 MOA) are quicker for close-quarters target acquisition.
Some optics offer multi-reticle systems (like dot + circle) for flexibility.
3. Durability and Construction
Your optic should handle the recoil and environmental exposure expected in combat or defensive use:
- 7075-T6 aluminum or forged housings offer excellent toughness.
- Ensure it’s shockproof, waterproof, and fog-resistant.
4. Battery Life and Power Management
A long battery life (like 20,000 to 50,000+ hours) is crucial. Features like:
- Shake Awake / Motion Sensor Technology
- Auto shut-off
- Side-loading battery trays
help maintain power efficiency and easy maintenance.
5. Optical Clarity and Brightness Settings
You want a red dot with:
- Multi-coated lenses for clarity.
- Daylight-bright reticle visibility.
- Night vision (NV) compatibility if you’re using it in low-light tactical scenarios.
6. Size and Weight
Compact red dots are ideal for concealed carry or duty use. Keep an eye on:
- Overall weight (lighter is better for slide-mounted optics).
- Low-profile designs that won’t snag on clothing or holsters.
7. Price and Brand Support
Balance your budget with features. Consider brands that offer:
- Lifetime warranties
- Responsive customer support
- Proven track records with law enforcement or military users
8. Co-Witnessing Capability
If you plan to use suppressor-height iron sights, make sure the red dot allows co-witnessing or works seamlessly with backup sights in case the optic fails.
Conclusion
The Best Red Dot for Sig P320 DH3 is a high-performance handgun that deserves an equally capable red dot sight. Whether you’re a professional shooter, competitor, or enthusiast, selecting the right optic can drastically improve your speed, accuracy, and confidence on target. From rugged durability and reliable battery life to advanced reticle options and quick target acquisition, the best red dot sights for the P320 DH3 combine cutting-edge technology with real-world reliability.
Ultimately, the best choice will come down to your intended use, budget, and personal preference—but any of the top-rated options reviewed offer outstanding value and performance for the Sig P320 DH3.