Here are the 5 best red dot sights for Sig P320.

Having extensively tested various optics over the past few years, I am confident in recommending these red dot sights for the Sig P320. 

 Any options that didn't meet these criteria didn't make it onto this list.

Best Red Dot For Sig P320 M18

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  • Best Overall
  • Best Brightness Control
  • Best Lens Durability
  • Best Durability
  • Largest FOV
fn 509 ls edge low light shoot

I recently upgraded to the Holosun 507C ACSS Vulcan red dot sight from the original 507C X2 model. What really stands out to me is the ACSS Vulcan reticle.

It's specifically designed to help me find and track the dot much faster, especially if I lose it in my field of view. I've even noticed it's quicker than the Trijicon SRO in some situations.

The 250 MOA size outer ring. It acts like a directional guide, helping me recenter the reticle if I need to. Plus, there's an option to turn off the outer ring and just use the ACSS triangle reticle for precise aiming.

holosun 507c acss reticle

The sight is made of sturdy 7075 T6 aluminum, which is the same as the original 507C. There's also this cool Shake Awake Technology that turns the optic off when it's not in use, which helps save battery life.

Leupold DeltaPoint Pro - Best Lens Protection

sig p320 xfive leupold deltapoint pro

When I get tired of using other red dot sights, I swap them with the Leupold DeltaPoint Pro on my Sig P320. 

For those of us with astigmatism, the 6 MOA red dot option works much better.


The larger red dot is not only easier to see but also aids in quicker target acquisition. The sight also features a lens hood that protects the main glass from direct impact.

See detailed DeltaPoint Pro reviews here

Sig Sauer ROMEO 1 Pro - Better Brightness Controls

sig p320

I've had the chance to use the Sig ROMEO1PRO on my Sig P320, and I must say, it's a top-notch miniature sig branded red dot sight. The aspheric lens is made of molded glass with upgraded coatings. It ensures excellent light transmittance and zero distortion. 

One of the best things about the ROMEO1PRO is its 12 brightness settings, and the max setting is plenty for a super sunny day. 

The built-in MOTAC (Motion Activated Illumination) system is similar to a Holosun red dot to save the battery life, but it's not as a must have in my opinion.

Trijicon RMR - Best Durability

(M17, M18, X Five slides require RMR hole drilling)

sig p320 rmr

I've equipped my Sig P320 with the Trijicon RMR Type 2, and it's been a game-changer for both duty carry and personal defense. The RMR Type 2 has undergone some design improvements such as tighter battery compartment for pistol use.

rmr red dot sight

The Trijicon RMR is by far the best micro red dot sight that set the benchmark for the rest of the red dot industry. However, the only downside to the optic is the bottom battery loading design.

I choose not to nitpick this feature because the battery's extremely long life means I rarely need to change it—perhaps only once every four years.

Given the RMR Type 2's overall performance and reliability, I consider this a minor compromise worth accepting.

Trijicon SRO - Largest FOV

sig p320 trijicon sro

I've been using the Trijicon SRO red dot sight on my Sig P320 for range training and competition shooting, and I must say, it's the best red dot sight I've used for this pistol. Its compatibility with the same footprint as the RMR makes it a seamless fit.

The ruggedness of the Trijicon SRO isn't the same as the RMR, but it's still great for range use and carry. 

trijicon sro battery access

The large circular field of view window improves my target acquisition speed and makes follow-up shots easier, even if my head position isn't perfectly aligned. This is particularly helpful in competition settings where speed and accuracy are paramount.

Another feature I find incredibly useful is the top-loading battery design. This means I can change the battery easily without having to remove the red dot sight or re-zero it, saving me time and hassle.

Check out the Trijicon SRO reviews

Sig P320 Red Dot Sight Buyer's Guide

Sig P320 Red Dot Compatibility

Sig p320 RX PRo AXG R1P slides

Referenced CHPWS

The new Sig P320 Pro cut and Sig P320 RXP are conceal carry ready with slide optic cut for the Sig ROMEO 1 Pro and Leupold Delta Point Pro.

Check out CHPWS adapter plate they have a large selection of optic plates specifically cut for each different variant of P320 Slides.

If your slide ONLY has the ROMEO 1 Pro cut, then a Trijicon RMR, Trijicon SRO, and Holosun 507C can't be mounted unless you send the slide to a shop to get it milled.

If your slide features the RMR and ROMEO 1 Pro/DPP holes, then all you need is a RMR plate.