Sig Romeo 1 vs Romeo 3 – Which is the Best Red Dot?


Choosing the most ideal red dot sight for all your shooting activities is not as easy as it seems. The good news is that for years now, the Sig Romeo industry has continued to release red dots of high standard. Sig Romeo 1 and 3 are amazing models guaranteed to benefit all types of shooters.

One of the best ways to enhance your precision and targeting skills by mounting a red dot onto your scope. These sights have been proven to work on all types of scopes ensuring that shooters can cover hundreds of yards with just a simple shot. The Sig Romeo 1 and Romeo 3 are both manufactured with excellent features that will benefit all types of shooters.

As a hunter, when I am in search of an ideal red dot optic, I like to hand test many functions on the sight. This includes the durability, the reticle, the accuracy, and the battery life. These factors are the best ways to find out if the optic is a good option for you.

What are the differences between Sig Romeo 1 vs Romeo 3?

Sig Romeo 1
Sig Romeo 3
If you are in need of a very quick target acquisition feature as well as a great level of precision, this reflex sight is a great option. It is small in size and maintains a standard zero. The TruHold twin adjustment springs ensures that the sight is able to maintain a lock-less zeroing system.
This is an open reflex sight that improves your firearm with amazing aiming functionalities. As a user you will get to use a bright red dot and the MOTAC feature. The lens is multicoated improving your light transmission and eliminating any kind of glare.
Reticle Size
3 MOA Dot
3 MOA Dot
Reticle Color
Not Applicable
Picatinny Mounts/Weaver Mounts
Lens Diameter
Windage Adjustment
100 MOA
100 MOA
0.8 Ounces
1.4 Ounces

Sig Romeo 1 vs Romeo 3 – How do they Compare? 

Brightness Level 

Both the Sig Romeo 1 and the Romeo 3 model are designed with 12 brightness settings. Shooters can use 10 of the brightness settings during the day as they are for ambient lighting conditions and two of these brightness settings are for night vision capabilities. Once you have got to the highest power setting; the optic will blink 5 times letting you know that you have achieved the highest setting.

The Romeo 3 model is designed with an enormous round lens measuring 35mm. This makes it larger than the 30mm lens diameter of the Romeo 1 model. Shooters can make use of any red notch reflector and this will allow you to achieve amazing light transmittance and an incredible level of brightness. When working with this lens you are guaranteed that you will not be affected by any distortion. If you are looking to achieve a clear image without any kind of distortion, the Sig Romeo 3 is a better option than the Romeo 1.  


The Sig Romeo industry manufactured both sights with aluminum material. When handling the Sig Romeo 1 and Romeo 3 you will be able to feel the strong and solid body. The Romeo 3 is designed with an extra-strong sight shield. This shield safeguards your red dot from the harsh dings and bangs when out on the field. An additional advantage is that this shield will still allow you to access the two control buttons on your optic.

There is also a very nice rubber lens that protects the lens of the Romeo 3 from any kind of harmful external factors. As a shooter, you are guaranteed that you will benefit from these excellent factors and your performance on the field will be improved. This makes the Romeo 3 a better option than the Romeo 1.

Battery Life

The Sig Romeo 1 and Romeo 3 are designed with two similar features. This includes the Motion Activated Illumination System (MOTAC) and the TRUHOLD. The optics are powered through Motion Sensing technology. As soon as your sight senses any kind of motion around it, it powers up and the power of the sight goes down as soon as there is no motion detected around. This feature is used to ensure that the battery life of the sight is preserved.

Sig Romeo 1 comes with a CR1632 battery that can run for 10,000 hours while the Sig Romeo 3 has a CR2032 battery that operates for 50,000 hours. The fact that the Romeo 3 is designed with a MOTAC feature and operates for 50,000 hours makes it a better option than the Sig Romeo 1. 

Sig Romeo 1 vs Romeo 3 – A Comparison Overview 

Sig Romeo 1

Sig Sauer Romeo 1 Mini Reflex 1x30mm 3 MOA Red Dot 1.0 MOA Handgun
  • The ideal sighting solution for the modern semi-automatic pistol as well as MSR platforms and shotguns
  • Dependable waterproof (IPX-7 rated for complete immersion up to 1 meter) and fog-proof performance
  • Extremely strong and lightweight CNC Magnesium housing ensuring a lifetime of reliable service
  • MOTAC (Motion Activated Illumination) powers up when it senses motion and powers down when it does not...

Sig Romeo 1 is available in both the 3 MOA and 6 MOA dot. Users get to make use of the mounting footprint and the SIG notes that will directly fit the optics. The window of this optic measures 30mm and the top-loading CR1632 battery is easy to find.

This optic’s operating controls are placed on the left side. To turn the sight on you can press the control button and to turn it off, you can depress the button for a total of two seconds. The Romeo 1 is designed with a Motion Activated Illumination System (MOTAC). When the sight does not detect any kind of movement for two minutes, it automatically goes to sleep mode. As soon as it senses some movement it powers on to the brightness level that had been previously set. The elevation and windage modifications are the exact 1 MOA clicks.

If your gun is not designed with a cut that will allow you to directly make use of the slide mount, the Picatinny rail will provide you with a ton of options.


  • This red dot is designed with a crisp and clear glass
  • It is affordable
  • Great and durable quality
  • Light in weight


  • The battery life could be better
  • The optic is designed with cheap plastic to remove the battery cap

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Sig Romeo 3 

The Sig Romeo 3 is designed with a 3 MOA and 6 MOA dots. It comes with a 1x magnification and measures 2.1 x 1.3 x 1.4 inches. This red dot also weighs a total of 1.5 ounces and you get to enjoy a wide 30mm sight window. Romeo 3 makes use of a CR2032 battery that is found on the right side. When replacing your battery, you do not have to detach the sight from the scope which is a great advantage.

Just like the Romeo 1, the operating controls are manufactured onto the left-hand side of the sight. When you want to turn on the optic, you can press any one of the control buttons for 2 seconds. To turn off this optic, you can follow the same steps. When the sight comes on, it is already set to the previous brightness level. To modify your brightness level, you can adjust using the up and down button. As soon as you have reached the maximum brightness level, the sight will blink five times.

You will also get to benefit from the Motion Activated Illumination System, (MOTAC). When the sight comes on and no movement is detected for over two minutes, it will automatically go off and as soon as any type of movement is felt, the sight will come on.


  • The body is very strong and durable
  • It is small size and maintains a zero
  • A great choice for the quick acquisition of targets


  • Designed specifically for pistols
  • The reticle intensity levels could be better

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Sig Romeo 1 and the Romeo 3 have both been manufactured with high-end electronic features and a great quality HD glass. The designs of both of these sights are inspired by the military and you will get to achieve a great level of precision, performance, and clarity.

Verdict: So, which one is better – Sig Romeo 1 or Romeo 3

The Sig Romeo 3 is a much better red dot than the Sig Romeo 1. The Romeo 3 outperforms Romeo 1 in all of the factors mentioned above. Its body is manufactured with a very strong shield that protects it when you are out in the field. The brightness levels are incredible and the battery life of 50,000 hours makes it a better option.

Frequently Asked Questions

  1. Is the Sig Romeo 1 or 3 designed with any type of solar power features?

No, they are not. To conserve battery life, both models make use of a Motion Activated Illumination System (MOTAC).

  1. Is Sig Romeo made by Holosun?

The Sig Romeo 5 is manufactured from a Chinese Holosun factory and the body cis designed with a Sig Sauer label.

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Terrence Miller
Terrence Miller is a hunter by birth, picking it up from a lineage of hunters and will probably hand the skill down to his son. He has been hunting since he was a young boy and has knowledge of both the new and old hunting equipment. This goes to say that the information provided is very reliable and conclusive. Using the hunting rifles and getting the right hunting gear seems to be a challenge for many individuals who want to learn the skill of hunting. And the reason why the information presented by Miller has detailed coverage on the different types of rifles, and rifle scopes. When not in the wild hunting, Miller loves horseback riding.


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