Finding the best red dot for SIG P320 is no small feat, especially with the vast sea of optics saturating the market. As someone who has tested, mounted, and fielded numerous red dot sights, I know firsthand how a good optic can transform your shooting experience — enhancing accuracy, speed, and overall performance.
In this article, I’ll walk you through an expert-backed, field-tested review of over five top-tier red dot sights that pair exceptionally well with the SIG Sauer P320. I’ll dive deep into each product, covering their technical specifications, features, strengths, weaknesses, and personal experiences with them. Additionally, I’ve scoured countless online forums, customer reviews, and professional feedback to back my insights.
Why You Should Trust My Review
I’ve spent the last decade immersed in the shooting sports world — from casual range days and competitive shooting events to tactical applications.
My SIG P320 has been with me through all of it, and I’ve equipped it with nearly every major red dot on the market.
My goal isn’t just to recommend what’s popular; it’s to help you choose what genuinely works — both in theory and practice.
Every optic in this article has been personally tested under real-world conditions, from wet weather to dusty ranges. Plus, I’ve gone the extra mile to include opinions from seasoned users in the community.
6 Top Picks Best Red Dot for SIG P320
- Trijicon RMR Type 2 – Best Overall
- HOLOSUN 507C – Best Value
- Leupold Deltapoint Pro – Best Field of View
- Sig Sauer Romeo1 – Best OEM Fit
- Swampfox Sentinel – Best Budget Option
- Aimpoint ACRO P-2 – Best Enclosed Emitter
1. Trijicon RMR Type 2 – Best Overall
The Trijicon RMR Type 2 stands as a legendary name among red dot sights — and for good reason. Its rugged aluminum housing, reliable electronics, and battery-saving features make it a favorite among military, law enforcement, and civilian shooters alike. The 3.25 MOA dot size is a sweet spot, offering precision without sacrificing rapid target acquisition.
Specifications:
- Dot Size: 3.25 MOA
- Battery Life: Over 4 years of continuous use
- Construction: Forged aluminum
- Mounting: Requires mounting plate for SIG P320 unless using optics-ready model
Best Features:
- Patented housing shape diverts shock away from the lens
- Dual illumination options
- Automatic brightness adjustment
Pros:
- Extremely durable
- Clear, crisp dot
- Trusted by professionals
Cons:
- Premium price point
- Buttons can be hard to manipulate with gloves
Personal Experience: I’ve run the RMR Type 2 through everything from pistol courses to outdoor competitions. Rain, mud, recoil — nothing fazes it. The dot stays zeroed, and the lens clarity is unmatched. Though I needed a plate to mount it to my standard P320, installation was straightforward with the correct tools.
Customer Feedback: On Reddit and AR15.com, most users echo my sentiments — especially praising its longevity and resilience. Some noted minor battery contact issues early in the product line, but these seem to have been resolved in later batches.
╰┈➤ Explore User Feedback and Current Pricing on Amazon
2. Holosun HS507C X2 – Best Value
Holosun has quickly carved out a name for itself in the optics game, and the 507C X2 is a shining example of why. It combines affordability with cutting-edge features — including a solar backup system, multiple reticle options, and motion activation.
Specifications:
- Reticle: 2 MOA dot, 32 MOA circle, or combo
- Battery Life: 50,000 hours
- Solar Failsafe
- Mounting: Requires mounting plate on most P320 models
Best Features:
- Shake Awake technology
- Solar panel as backup power
- Multiple reticle choices
Pros:
- Great battery life
- Versatile reticle
- Competitive price
Cons:
- Slight tint on the lens
- Bulkier than some alternatives
Personal Experience: This is my go-to recommendation for shooters on a budget who don’t want to compromise on performance. I was surprised by how quickly I adapted to the reticle system. The solar panel came in handy on a range trip where I had forgotten to check the battery — it just kept working.
Customer Feedback: Holosun fans are a vocal bunch. In YouTube comment sections and gun forums, the 507C is often hailed as the best bang-for-buck option. Some users noted the side buttons were a little stiff at first but loosened over time.
╰┈➤ Explore User Feedback and Current Pricing on Amazon
3. Leupold DeltaPoint Pro – Best Field of View
The DeltaPoint Pro is a heavyweight contender that boasts one of the clearest, widest fields of view in the micro red dot market. Its top-loading battery and tool-free adjustments are small design features that make a huge difference in everyday use.
Specifications:
- Dot Size: 2.5 MOA
- Battery Life: 300+ hours
- Construction: Aluminum housing
- Mounting: Available P320-specific mount; some models may need adapter plate
Best Features:
- Crisp 2.5 MOA dot
- Exceptional window size
- Tool-less windage and elevation adjustment
Pros:
- Large sight picture
- Easy battery replacement
- Very intuitive controls
Cons:
- Shorter battery life
- Slightly heavier
Personal Experience: I love this optic when shooting steel or practicing transitions — the wider window gives me confidence and speed. The dot is clean and consistent, and the motion sensor wakes it up instantly. However, I did have to get a custom plate for proper fitment on my P320 M17.
Customer Feedback: Many users on pistol subreddit threads rave about the clarity and usability of the DeltaPoint Pro. It’s a favorite among competition shooters for its speed. Battery life complaints do surface occasionally but are rarely a dealbreaker.
╰┈➤ Explore User Feedback and Current Pricing
4. SIG Romeo1Pro – Best OEM Fit
If you’re looking for an optic that slots right into your SIG P320 without fuss, the Romeo1Pro is a natural pick. Designed specifically for the P320 series (especially the X-series), this red dot makes mounting as easy as screwing it in.
Specifications:
- Dot Size: 3 MOA
- Battery Life: 20,000+ hours
- Mounting: Direct fit on P320 X-Series slides
Best Features:
- Molded glass lens with distortion-free view
- MOTAC (Motion Activated Illumination)
- Solid aluminum housing
Pros:
- Seamless integration with SIG pistols
- Motion-sensing activation
- Clean, large viewing window
Cons:
- Not as durable as RMR-type optics
- Fewer aftermarket support options
Personal Experience: I loved how quickly I could install the Romeo1Pro — no adapter plates or headaches. The sight picture is impressively open, and the controls are easy to manipulate. I’ve put a few thousand rounds through it on my P320 X5 Legion, and it’s held zero throughout.
Customer Feedback: SIG owners often opt for this red dot out of convenience. Most report positive experiences, though some wish it had better sealing against moisture. On SIGTalk and similar communities, it's often mentioned as the "default" choice.
╰┈➤ Explore User Feedback and Current Pricing on Amazon
5. Swampfox Justice – Best Budget Option
Don’t let the price tag fool you — the Swampfox Justice punches above its weight. It’s a solid performer for shooters who want a simple, reliable red dot without breaking the bank.
Specifications:
- Dot Size: 3 MOA
- Battery Life: 5,000 hours (medium setting)
- Mounting: RMR footprint; needs plate on standard P320s
Best Features:
- Shake Awake tech
- 7075-T6 aluminum housing
- Ultra-clear multi-coated glass
Pros:
- Affordable
- Good glass quality
- Compatible with common mounting standards
Cons:
- Shorter battery life
- Slightly less refined housing
Personal Experience: I mounted the Justice on a spare slide and was pleasantly surprised by its performance. The dot is bright, and adjustments are simple. It's not quite as robust as the high-end sights, but for casual shooting or training, it's hard to beat.
Customer Feedback: Many reviewers on Amazon and OpticsPlanet praise its clarity and value. A few noted it’s not ideal for duty use but perfect for range guns.
╰┈➤ Explore User Feedback and Current Pricing on Amazon
6. Aimpoint ACRO P-2 – Best Enclosed Emitter
The ACRO P-2 is built like a tank. It’s the go-to for those who prioritize an enclosed emitter system to protect against the elements — making it ideal for adverse conditions or duty use.
Specifications:
- Dot Size: 3.5 MOA
- Battery Life: 50,000 hours
- Mounting: Requires dedicated mounting plate
Best Features:
- Fully enclosed emitter
- Extreme battery longevity
- Waterproof to 35 meters
Pros:
- Sealed from dirt, water, debris
- Highly durable
- Excellent battery life
Cons:
- Heavier than most
- Bulkier design
Personal Experience: I use the ACRO P-2 when I know I’ll be training in harsh conditions. The peace of mind that comes from a sealed optic is worth the extra weight. It takes a bit more effort to mount properly, but once it's on, it’s rock solid.
Customer Feedback: On pistol forums and law enforcement threads, the ACRO P-2 is frequently praised for its rugged reliability. Many mention it as their top pick for EDC or professional use.
╰┈➤ Explore User Feedback and Current Pricing on Amazon
Final Thoughts
Choosing the best red dot for SIG P320 depends on your needs — whether you’re an occasional range shooter, competitive marksman, or duty-bound professional. From the ultra-rugged Trijicon RMR Type 2 to the budget-friendly Swampfox Justice, there’s something here for everyone.
After testing and retesting, I still believe that matching the optic to your intended use — and not just going for the most expensive model — is the real key to satisfaction. Whatever you choose, make sure it’s a reliable partner for your SIG.
And there you have it — a tested, hands-on guide to finding the best red dot for SIG P320. Stay sharp and shoot straight!
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