Choosing the right red dot sight for your Sig P320 is a critical decision that can dramatically enhance your shooting accuracy and speed. With so many options on the market, from rugged duty-ready optics to feature-packed competition models, finding the perfect match for your needs can be a challenge. Whether you use your P320 for home defense, competitive shooting, or as a duty weapon, the right optic makes all the difference.
Our team has put the leading red dot sights through their paces to determine which models truly stand out. This expert-tested roundup cuts through the noise to bring you a selection of the best optics available, detailing the unique benefits and features of each to help you make an informed decision for your firearm.
Our Top Picks for Sig P320 Red Dot Sights
- Leupold DeltaPoint Pro Red Dot Sight, 2.5 MOA Dot
- Holosun HS507C-X2 ACSS Vulcan Red Dot Sight
- Trijicon RMR Type 2 Adjustable LED 3.25 MOA
- Sig Sauer ROMEO1PRO 1x30mm 6 MOA Red Dot Sight
- Holosun HE507C-GR X2 Green Dot Solar Power
- Trijicon SRO 1 MOA Red Dot Sight
- Holosun HS508T-X2 Titanium Enclosed Red Dot
- Sig Sauer ROMEO2 3 MOA Red Dot Sight – FDE
Leupold DeltaPoint Pro Red Dot Sight, 2.5 MOA Dot
The Leupold DeltaPoint Pro is a professional-grade red dot built to withstand harsh conditions. It features Leupold’s advanced optical system for exceptional light transmission and industry-leading glare reduction, providing a clear, bright sight picture even in direct sunlight. The 2.5 MOA dot offers a precise aiming point for accurate shots at various distances.
This sight is engineered for reliability and speed. Its motion sensor technology automatically powers the sight on when it detects movement and powers it down to conserve battery life when not in use. The wide field of view and low-profile design make acquiring targets fast and intuitive, a significant advantage on a versatile platform like the Sig P320.
Holosun HS507C-X2 ACSS Vulcan Red Dot Sight
The Holosun HS507C-X2 with the ACSS Vulcan reticle is an excellent choice for shooters new to red dots. Instead of a standard dot, it uses a large outer circle that collapses into a precise chevron when the sight is properly aligned. This unique system provides a clear visual cue that helps correct common presentation errors, drastically speeding up the learning curve.
Beyond the innovative reticle, this optic is packed with features including the versatile Shake Awake technology, multiple brightness settings, and a durable housing. It offers a fantastic balance of user-friendly design and advanced functionality, making it a top contender for both training and serious use on your P320.
Trijicon RMR Type 2 Adjustable LED 3.25 MOA
The Trijicon RMR Type 2 is the gold standard for rugged reliability in a micro red dot sight. Built with a forged housing from aerospace-grade aluminum, it is designed to withstand extreme abuse and continue functioning. Its legendary durability has made it the preferred choice of military, law enforcement, and civilian users who depend on their equipment in critical situations.
This model features an adjustable LED with a 3.25 MOA dot, offering an ideal balance between precision and speed. The proprietary housing design is engineered to protect the lens and electronic components from impact, directing force away from the critical parts. If your primary requirement is absolute toughness, the RMR Type 2 is a proven performer.
Sig Sauer ROMEO1PRO 1x30mm 6 MOA Red Dot Sight
Designed specifically for Sig Sauer handguns like the P320, the ROMEO1PRO offers seamless integration and optimal performance. It features a 6 MOA dot that is fast to acquire, making it ideal for close-quarters and dynamic shooting scenarios. The sight is built with a durable aluminum housing and includes a metal shroud for added protection against impacts.
Sig Sauer equipped the ROMEO1PRO with MOTAC (Motion Activated Illumination), which powers the sight up when it senses motion and powers it down after a period of inactivity to save battery. With its direct-fit footprint on many P320 models and features tailored for a handgun, this optic feels like a native extension of your firearm.
Holosun HE507C-GR X2 Green Dot Solar Power
The Holosun HE507C-GR X2 stands out with its vibrant green multi-reticle system. You can choose between a 2 MOA dot, a 32 MOA circle, or a combination of both. Many shooters find a green reticle easier and faster to pick up against various backgrounds, especially in outdoor environments.
This model includes Holosun’s Solar FailSafe technology, which allows the sight to operate using ambient light if the battery fails. Combined with the super-efficient Shake Awake feature, it offers exceptional battery life and reliability. The combination of a green reticle, multiple reticle choices, and solar backup makes this a highly versatile optic for your P320.
Trijicon SRO 1 MOA Red Dot Sight
The Trijicon SRO (Specialized Reflex Optic) is designed with one primary goal: to be the fastest red dot for competitive shooting. Its enormous, unobstructed window provides a spectacular field of view, allowing you to track the dot easily during rapid transitions and recoil. The low-profile housing sits far back on the slide, minimizing any visual distraction.
While incredibly tough, the SRO’s design prioritizes a clear, wide-open sight picture over the extreme top-impact durability of the RMR. It features a simple, easy-to-use battery tray and a clear, crisp dot. For action pistol competitions or any application where speed is paramount, the SRO is in a class of its own.
Holosun HS508T-X2 Titanium Enclosed Red Dot
The Holosun HS508T-X2 features a fully enclosed emitter, a key advantage for those who use their firearm in adverse conditions. The internal lenses are protected from rain, snow, mud, and lint, ensuring the emitter remains clear and the dot is always visible. The housing is constructed from rugged titanium, offering excellent strength without excessive weight.
It includes all the hallmark Holosun features, such as the multi-reticle system (dot, circle, or both), Shake Awake, and a side-loading battery tray for easy replacement without removing the sight. This optic is an outstanding all-weather option that combines the durability of an enclosed emitter with a full suite of modern features.
Sig Sauer ROMEO2 3 MOA Red Dot Sight – FDE
The Sig Sauer ROMEO2 represents a significant step forward in red dot durability and versatility. It features a unique modular design with a removable protective hood. You can run it in a low-profile, open-emitter configuration or install the full enclosure for maximum lens protection in demanding environments.
Built from 7075-T6 aluminum and available in a Flat Dark Earth finish, the ROMEO2 is as tough as it is adaptable. It includes Sig’s MOTAC technology and is designed to be exceptionally resistant to the elements. This optic is for the user who demands the ultimate in configurable protection and performance from their P320 sight.
Buying Guide: How to Choose the Best Red Dot for Your Sig P320
Choosing the right red dot for your Sig P320 isn’t just about picking the shiniest one. It’s about matching the optic to your specific needs, whether that’s for competition shooting, home defense, or duty carry. Having tested dozens of optics on this platform, I’ve found a few key factors that will make or break your experience.
First, you need to consider the footprint. This is the pattern of screw holes on your P320’s slide that the optic mounts to. The most common footprint for the P320 is the Sig Romeo1Pro pattern, but many slides are also cut for the Doctor/Noblex pattern or the Leupold DeltaPoint Pro. Some newer models even come with multiple footprint options. If your chosen red dot doesn’t match your slide’s footprint, you’ll need an adapter plate, which adds height and potential failure points. Always check your specific P320 model’s cut before buying.
Next is window size and lens clarity. A larger window gives you a bigger picture, making it easier to acquire the dot, especially when you’re not in a perfect shooting stance. This is a huge advantage in dynamic situations. However, a larger window usually means a bigger and heavier optic. Lens clarity is about how distortion-free the glass is. A good red dot should have a crisp, clear view with minimal color tint. I always prefer a slight blue or no tint over a heavy green or red tint, as it feels more natural to my eye.
Durability and battery life are non-negotiable. Your red dot is going to live on a reciprocating slide, getting slammed back and forth with every shot. It needs to be tough enough to handle that punishment indefinitely. Look for optics made from billet aluminum and with a proven track record. Battery life is equally critical. The best red dots for a Sig P320 offer tens of thousands of hours of runtime, often on a common battery like a CR2032. Even better are models with “shake awake” technology, which turn the dot on when they sense motion and put it to sleep when stationary, dramatically extending battery life. You don’t want to be fiddling with buttons or worrying about a dead dot when you need it most.
Finally, think about the dot itself. The size of the dot is measured in MOA (Minutes of Angle). A smaller 2-3 MOA dot is precise, great for target shooting or making accurate shots at distance. A larger 5-6 MOA dot is faster to pick up and great for close-quarters, defensive use. Some models offer multiple reticle choices, which gives you flexibility. Brightness settings are also key; you need a dot that is visible in bright daylight but won’t wash out your night vision on its lower settings.
FAQ
What is the most durable red dot sight for a Sig P320?
In my testing, the Trijicon RMR Type 2 is consistently the king of durability. Its housing is designed to withstand incredible abuse, and its reputation is built on real-world use by military and law enforcement. The battery compartment is separate from the sealing body, which helps maintain its waterproof integrity. If your primary concern is having an optic that will absolutely survive anything, the RMR is the top choice for your Sig P320.
Do I need to get my slide milled for a red dot?
It depends on your specific P320. Many newer P320 models come from the factory with slides that are already “optics-ready” or “cut” for a specific red dot footprint. You can usually just remove the cover plate and directly mount a compatible optic. If your P320 is an older model with a standard, non-optics-ready slide, then you will need to have a gunsmith mill it for your chosen red dot’s footprint. This is a permanent modification, so be sure of your choice.
What MOA dot size is best for a pistol like the P320?
This is largely personal preference and depends on the pistol’s intended role. For a general-purpose or home defense P320, I find a 3.25 or 3.5 MOA dot to be an excellent balance. It’s small enough for precise shots out to 25 yards but still large enough to acquire quickly up close. If you’re strictly using it for USPSA or Steel Challenge competition where speed is everything, a 6 MOA dot can be faster. For a dedicated long-range pistol, a 1 or 2 MOA dot would be preferable.
How does “shake awake” technology benefit a pistol red dot?
Shake awake is a game-changer for an everyday carry or duty pistol. The optic automatically goes into a sleep mode after a period of inactivity to save battery. The moment you pick up the gun and it senses motion, it instantly turns the dot on. This means you never have to remember to turn your sight on, and you get the benefit of an always-ready dot with battery life that can last for years. It removes a potential point of user error in a high-stress situation.
Can I co-witness my iron sights with a red dot on the P320?
Yes, and I highly recommend it. Co-witnessing means your backup iron sights are visible through the red dot’s window. If your red dot fails, your sights are already aligned in your field of view. To achieve this, you need iron sights that are tall enough to see over the body of the mounted red dot. These are called “suppressor-height” sights. Most optics-ready P320 kits will include these taller sights, or you can purchase them separately. It’s a critical backup system that gives you great peace of mind.