Upgrading your SIG P320 Compact with a high-quality Best Red Dot for P320 Compact can transform the way you shoot, carry, and defend. Modern micro-dots combine rugged durability, crisp optics, and advanced electronics to help you acquire targets faster, maintain better accuracy under stress, and perform confidently in low-light or high-pressure situations. Whether you’re a casual range shooter, a competition enthusiast, or carry your P320 Compact for personal defense, the right red dot can enhance speed, precision, and overall versatility.
With so many options on the market, from the lightweight Holosun 407C to the wide-window Trijicon SRO or the tough Holosun 509T, choosing the best sight can be overwhelming.
Factors like slide compatibility, reticle size, window clarity, battery life, durability, and holster fit all matter when picking the right optic for your setup.
This guide breaks down the top red dots for the P320 Compact, highlighting features, pros, and cons to help you make an informed, confident choice.
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| 1) Trijicon RMR (Type 2) |  |
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| 2) SIG ROMEO1 Pro |  |
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| 3) Leupold DeltaPoint Pro |  |
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| 4) Holosun 509T |  |
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| 5) Holosun 407C |  |
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| 6) Trijicon SRO |  |
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Why Upgrade Your SIG P320 Compact with a Red Dot Sight
Upgrading your SIG P320 Compact with a Red Dot Sight is important because this is a compact firearm that is both highly accurate and operates on a single battery pack. The following is a concise, sensible overview of why the swap is something to consider.
- Less time to aim at something
The red dot does not require alignment of the front and back sights. The trained eye, of course, picks up the glowing dot and lays it on target, which saves a fraction of a second on your draw-to-first-shot time – important on the defensive or on the competition side.
- Better performance under stress
When you are under pressure, your fine motor control and visual attention fail. One aiming point (the dot) is less difficult to maintain on target than three sights, which are more likely to increase the probability of hitting, at least in close to moderate range.
- Less difficult follow-up shots
Since you are keeping the same sight picture, transitions and follow-ups are quicker and smoother, since you do not have to reacquire the target between shots. It is beneficial on a small pistol where shots number two and three are important to get quickly and accurately.
- Enhanced low-light capabilities
A number of the red dots have brightness adjustments and NV-friendly modes to ensure that the reticle is visible in low-light situations in which iron sights are difficult to acquire rapidly.
- Faster learning
To a large number of shooters, the red dot reduces the learning curve – beginners learn to be competent quicker, and experienced shooters realize precision that can be repeated without thinking about where the sights are.
- Compromises in practical carry
Contemporary pistol dots are small and light. With the correct model, there is no shortage of holster options, and concealability is not significantly influenced.
How We Picked the Best Red Dots for the SIG P320 Compact
Selection criteria:
- Slide compatibility/footprint – native optic-ready cuts, mounting plates are available, compatibility with P320 Compact deck height.
- Sturdiness and construction- materials (7075 aluminum, titanium), IP, shock, and recoil-free zero retention.
- Optical quality- dot sharpness, lens quality, coating, and window size to be used to obtain rapid acquisition.
- Reticle choices and MOA –1-6 MOA choices and the presence of multi-reticle modes (circle + dot).
- Battery design/life Cell type- top/side/tray access, battery run time, backup (solar/Shake-Awake).
- Controls & ergonomics –user-friendly buttons, lock modes, MOTAC, and access when holstered.
- Weight/footprint- effect on concealment, holster fit, and slide balance.
- Value & availability- MSRP vs features, warranty, and ease of purchase in large markets.
- Holster and accessories ecosystem-P320 Compact has holsters and accessory plates available.
- Actual user experience feedback- frequent failure modes and accolades of seasoned shooters.
Quick Comparison Table
| Feature | Trijicon RMR Type 2 | SIG ROMEO1 Pro | Leupold DeltaPoint Pro | Holosun 509T X2 | Holosun 407C X2 | Trijicon SRO |
|---|---|---|---|---|---|---|
| Reticle Type | 3.25 MOA Dot | 3 MOA Dot | 2.5 MOA Dot | 2 MOA Dot & 32 MOA Circle | 2 MOA Dot | 1.0, 2.5, or 5.0 MOA Dot |
| Weight | 1.2 oz (34.02 g) | 1 oz (28.35 g) | 1.9 oz (53.8 g) | 1.72 oz (48.7 g) | 1.5 oz (42.5 g) | 1.6 oz (45.36 g) |
| Battery Life | 4 years (CR2032) | 20,000 hrs (CR1632) | 300 hrs (CR2032) | 50,000 hrs (CR1632) | 50,000 hrs (CR1632) | 3 years (CR2032) |
| Housing Material | Forged Aluminum | Aluminum | Aircraft-Grade Aluminum | Grade 5 Titanium | 7075-T6 Aluminum | 7075-T6 Aluminum |
| Window Size | 1.8″ x 1.1″ | 30 mm | 1.82″ x 1.31″ | 0.66″ x 0.9″ | 0.63″ x 0.91″ | 1.0″ x 1.3″ |
| Brightness Settings | 8 (2 NV) | 10 (2 NV) | 8 | 12 (2 NV) | 12 (2 NV) | 8 (Auto & Manual) |
| Battery Access | Side | Top | Side | Side | Side | Top |
| Water Resistance | IP67 | IPX-7 | Waterproof to 33 ft | IP67 | IP67 | IPX6 |
Best Red Dot for P320 Compact
1) Trijicon RMR (Type 2)
The Trijicon RMR Type 2 is a small, proven battle reflex sight that is a combination of toughness and ease of use, and uses that shooters would otherwise believe a micro red-dot should possess.
Constructed with a forged-aluminum housing and a rough sealed window, and has an LED reticle and provides automatic brightness regulation and manual brightness regulation. This ensures that the dot is visible in bright daylight and at low enough settings to be used by concealed personnel.
A small footprint and low profile make it a natural extension of the SIG P320 Compact (when the proper slide cut or mounting plate is used), and the unobtrusive 1x view is both parallax-free and can be used to achieve a quick target acquisition, yet also make accurate aiming at moderate distances possible.
Designed by Trijicon to endure extremes, it is shockproof, has a watertight seal, and the windage/elevation can be adjusted in clicks positive to MOA, so once set to zero, it stays that way indefinitely.
Battery life is exceptional under normal conditions – it is measured in years of regular operation using a single CR2032 – and the Type 2 also has the characteristics of programming (auto-off timers and various brightness levels) that save power.
Key specs
- Reticle options: 1 MOA, 3.25 MOA
- Power: 1 × CR2032 battery; 4+ years
- Body: Forged 7075-T6 aluminum, nitrogen-purged (waterproof/fog-proof).
- Weight: 1.2 oz (34 g).
- Dimensions: 1.8″ × 1.1″ × 1.0″.
- Magnification: 1×, unlimited eye relief.
Pros
- Extremely durable
- Crisp, stable dot with multiple MOA choices for different shooting needs.
- Very light and compact, good for the P320 Compact without adding much weight.
- Xtreme Tactical
Cons
- Bottom-access battery
2) SIG ROMEO1 Pro
The SIG ROMEO1 Pro is a small open-reflex red dot pistol-specifically designed which integrate a low profile with duty-grade characteristics that make it a good fit on a SIG P320 Compact.
It has a bright and distortion-free sight view with its aircraft-grade aluminum housing and an aspirated, multi-coated lens with a 30 mm window, and is so light and unobtrusive on the slide.
Features a point-source emitter with 3 MOA or 6 MOA dots, 12 brightness modes, and can be turned on to motion-activated illumination (MOTAC) to conserve the battery when the pistol is not in use.
SIG improved the electronics and emitter of previous ROMEO models and also made the brightness usable and battery life much longer.
Provides a big, readily handheld dot, simple user controls, and a form factor that is compatible with SIG factory optic slide cuts. It is a reasonable compromise of both high-end micro-dots and budget reflexes: more reasonable and long-lasting than a lot of less expensive models, and less expensive and less conspicuous than some higher-end wide-window sights.
Key specs
- Dot sizes: 3 MOA or 6 MOA.
- Brightness settings: 12 (10 daylight + 2 NV).
- Battery: CR1632; battery life: up to ~20,000 hours.
- Lens/window: 30 mm aspheric lens (
- Weight: 1.0 oz (28–34 g).
- Water rating: IPX-7
- Adjustments: 1 MOA clicks
Pros
- Bright, easy-to-acquire dot with a large open window.
- Long battery life and motion-activated power saving.
- Built for pistol use
- Good weather resistance and solid construction for carry/duty.
Cons
- Open reflex design sits a bit higher than some enclosed-emitter micro-dots.
3) Leupold DeltaPoint Pro
The Leupold DeltaPoint Pro (DPP) is a well-designed reflex sight that combines an extremely wide field of view with gun-tough attributes.
When mounted, it is larger and more glass-forward than most micro-dots: the near full-width aspheric lens and low-distortion finishes give an excellent viewing picture, which makes acquisition of the target quick and natural, particularly with pistols which are compact pistols.
Leupold made the DPP to be strong and serviceable – aluminum-built, DiamondCoat lens protection, sealed/fogproof internals, and all-day carry make it durable and tough.
Has a tool-free battery door to replace CR2032 cells without necessarily taking the reticle out, and Motion Sensor Technology (MST) can save battery by putting the reticle in standby when idle and instantly on when in motion. The adjustments are fine, 1-MOA clicks and several brightness options (including low/NV options on NV models) allow you to adjust the dot to bright daylight or dim lighting.
In general, DeltaPoint Pro is a very nice option in case you want to have a fast sight picture, a solid construction at a decent price, and the features that make it easier to carry and maintain.
Key specs
- Dot: 2.5 MOA (also available in 6 MOA).
- Battery: 1 × CR2032 (top/tool-less access).
- Brightness settings: 8 (motion sensor + auto standby/MST).
- Dimensions: ~1.82″ × 1.31″ × 1.30″ (L×W×H).
- Weight: ~1.9–2.0 oz (with battery).
- Adjustments: 1 MOA per click (windage/elevation).
Pros
- Extremely wide, clear field of view for fast target acquisition.
Sporting Shooter - Top/tool-less battery access so you can swap cells without re-zeroing.
- Motion Sensor Technology extends battery life and simplifies carry readiness.
- Rugged build with scratch-resistant lens coating and waterproof/fogproof sealing.
Cons
- Higher profile/size compared with the smallest micro-dots
4) Holosun 509T
The Holosun 509T (X2/HE509T series) is a heavy-duty enclosed-emitter pistol sight by Holosun that is designed to be a modern electronics-equipped titanium-bodied pistol sight with extra-duty features that is aimed at duty/carry applications.
Its Grade-5 titanium casing and the closed window of the 509T also make it feel like a tank without much weight, though large enough to be a full-size pistol optic; the enclosed construction of the unit helps prevent hitting the target with it, tossing out debris or rain, and allows the 509T to be used hard and rough.
The sight is equipped with the Super-LED of Holosun and provides the Multi-Reticle System (MRS) of the company, which is a 2 MOA dot with a 32 MOA circle, to select the most suitable reticle, either speed or precision, without switching optics.
Solar Failsafe and high-efficiency coin cell (CR1632) allow the camera to have long run time (up to about 50,000 hours on some settings), and Shake-Awake / motion-activated lighting helps to save battery and hold the dot instantly ready when the gun is in motion.
Three reviews have touted the optical sharpness and crystal reticle sharpness of an enclosed emitter, and most package lineups come with mounting equipment or adapter plates to accommodate common pistol footprints.
In general, the 509T targets the needs of those shooters with a desire to have a durable, sealed pistol dot with modern conveniences (solar back-up, long battery life, side/tray battery access) and who will not mind a slightly larger proprietary footprint in return.
Key specs
- Reticle: 2 MOA dot + 32 MOA circle (MRS)
- Power: CR1632 battery + Solar Failsafe; up to 50,000 hr life
- Battery access: Side/tray style
- Window size: 0.66″ × 0.90″.
- Weight: 1.72 oz.
- Housing: Grade-5 titanium
Pros
- Extremely durable titanium, enclosed-emitter construction
- Multi-Reticle System (circle + dot) gives flexible aiming options for speed or precision.
- Solar Failsafe + long battery life and Shake-Awake make it very low-maintenance.
- Side/tray battery access is convenient for quick swaps without removing the optic.
Cons
- Proprietary / larger footprint than RMR-style mounts
5) Holosun 407C (X2)
The Holosun 407C (X2) is a small, RMR-sized reflex sight designed specifically as a low-priced, pistol-ready, micro dot.
Its size and weight are such that it fits well in small pistols such as the SIG P320 Compact and still leaves a usable sight window.
Built on a 7075-T6, anodized aluminum rear, and the X2 electronics package is included with Shake-Awake, an auto/manual brightness switch, and a tray-like battery compartment to make it easy to replace the CR1632 cell without ever having to take the optic out of the slide.
In battery economy and practical durability, the 407C is seen to shine: Holosun claims up to approximately 50,000 hours of operating time on a medium power setting, and the camera has an IP67 water/protection rating to carry on a daily basis.
Shooters who desire a lightweight, full-featured, and low-priced RMR-footprint dot on a P320 Compact, the 407C X2 remains among the value-priced options that offer a lot of features.
Key specs
- Reticle: 2 MOA dot.
- Battery: 1 × CR1632 (tray access) + Solar Failsafe.
- Battery life: up to 50,000 hours (setting dependent).
- Window: 0.63″ × 0.91″.
- Weight: 1.5 oz (42 g).
- Housing: 7075-T6 aluminum; IP67 rated.
Pros
- Excellent value: strong feature set (solar failsafe, Shake-Awake)
- Long battery life with solar backup
- Lightweight and compact, fits RMR footprint slides and many pistols easily.
- Tray battery access for quick swaps without removing the optic.
Cons
- Smaller field of view than wide-glass sights (trade-off for compactness)
6) Trijicon SRO
A wide-window pistol red dot that has been designed to be as fast and practical to carry is the Trijicon SRO.
Unlike the larger and heavier micro-dots, the SRO focuses on almost a full-width lens that provides an incredibly large and unobstructed field of view, making it very fast to focus on the target and the sight picture on small pistols such as the SIG P320 Compact exceptionally intuitive with the right plate or slide cut.
The view combines hardened 7075-T6 aluminum construction with real pistol-grade sealing with a real glass, so that it withstands everyday carry and hard use, and the open-emitter design creates a bright, crisp dot that is readable in most lights.
Has a variety of manual brightness controls, an automatic mode, NV-friendly low settings, and a top-loading CR2032 battery with a lifespan of years with moderate settings, according to Trijicon.
Windage and elevation are available in 1-MOA steps, with a liberal amount of total travel, and the sight is cut/compatible with either the typical RMR footprints or slide-mounts of your choice, depending on your pistol.
Often praised by reviewers as a balance between clarity, speed, and a solid construction, which is a good choice when the shooter is looking to use a bigger-glass reflex without making the jump to a significantly larger optic.
With that said, the SRO is a different experience than small, very low-profile dots due to its open design and a bigger window; some users describe it as being like an RMR but with the SRO being slightly higher and with a speed-first sight picture.
Key specs
- Dot options: 1.0 MOA, 2.5 MOA, or 5.0 MOA.
- Window: 0.98″ × 0.89″ (25 × 22.5 mm).
- Power: 1 × CR2032 (top-loading).
- Battery life: 3+ years (typical use, setting dependent).
- Dimensions: 2.2″ × 1.3″ × 1.4″. Weight: 1.6 oz (45–46 g).
Pros
- Very large, unobstructed window for the fastest possible target acquisition.
- Crisp, bright dot and pistol-tuned controls.
- Top battery access and reliable battery life.
- Rugged build and waterproof rating suitable for carry/duty.
Cons
- Higher profile / larger footprint
Factors to Consider when Choosing The Best Red Dot for P320 Compact
- Footprint and Slide Compatibility
The initial thing that you should do is to make sure that your optic fits on the slide of the P320 Compact. Others are optic-ready at the factory, and others may need an adapter plate.
Ensure that you have checked the type of footprint (RMR, DeltaPoint Pro, or SIG ROMEO1 Pro) prior to buying. It fits well to keep the sight low to the bore, allows co-witnessing iron sights, and allows your optic to be held zero during recoil.
- Reticle Size and Type (MOA)
The size of the reticle is a major factor that determines the speed at which you train your targets.
- 2-3 MOA dots have the attributes of accuracy and range.
- 5-6 MOA dots are quicker to acquire the target, either in defensive or competition mode.
- Size of the windows and transparency of the airways
The bigger the window, the better the field of view in which you see the dot once the recoil. Trijicon SRO or the Leupold DeltaPoint Pro are good optics in this regard.
Search to find the highest-grade glass that has anti-reflective finishes and coatings to reduce distortions and glare. Choose open emitters or enclosed emitters.
- Resistance to Durability and Environment
An optic that can withstand the elements is required on a carry gun. Search photos of models based on either 7075-T6 aluminum or titanium with an IPX6/IP67 waterproof rating of at least.
The optic must still be zero after hundreds of rounds and can be dropped and lost in sweat and harsh treatment. Arguably, creating a sense of security during the duty or defensive use, reinforced housings and protective shrouds (such as the Holosun 509T) are also added to them.
- Size, Weight, and Ergonomics
Small red dots retain the balance and concealability of the pistol. Lightweight optics reduce slide drag and holster problems.
Make controls convenient to operate, even when wearing gloves. Co-witnessed backup irons are also better with low-profile sights, and this will provide you with a backup in the event of a battery failure.
FAQs
- Do I need an optic-ready slide to mount a red dot on my SIG P320 Compact?
Not always. If your P320 Compact comes optics-ready (such as the P320 RXP or M18 models), it will accept compatible red dots directly or with a simple plate.
If not, you’ll need an adapter plate or aftermarket slide with an optic cut. Always match the footprint (RMR, DeltaPoint Pro, or ROMEO1 Pro) to your chosen sight to ensure a secure fit and proper sight height.
- Can I co-witness my iron sights with a red dot?
Yes, if you use the right combination of low-profile optic and suppressor-height sights.
Many shooters install taller backup irons to co-witness through the red dot window, giving them a fail-safe aiming option if the battery dies or the optic malfunctions.
- What’s the average battery life of a quality red dot sight?
Most premium red dots deliver between 20,000 and 50,000 hours of use on medium brightness.
Models with motion-activated systems (MOTAC, Shake-Awake) or solar backup last even longer. Always check for top or side battery access so you can replace cells without removing and re-zeroing your optic.
Final Thoughts
A red dot sight is more than just an accessory for your SIG P320 Compact; it’s an investment in speed, accuracy, and reliability.
The right optic improves target acquisition, makes follow-up shots faster, and reduces the stress of aligning iron sights under pressure. From premium options like the Trijicon RMR Type 2 and SRO, to value-focused sights like the Holosun 407C or SIG ROMEO1 Pro, there’s a model suited for every shooter and budget.
Also check out: 5 Best Red Dot for Compact 9mm