Sig Sauer Romeo 5 vs Romeo 4 Scope: Head to Head Comparison for 2021

Sig Sauer builds great firearms.  There is no question about that. Sig Sauer also builds fine optics.  There is no doubt about that either.  For anyone looking for a compact red dot scope, the Sig Sauer Romeo line of scopes may be an answer.  The question may boil down to which is better for you, the Romeo 4 or Romeo 5 scope?

You won’t go wrong choosing a Sig Sauer scope, no matter which variety or model.  Sig builds excellent optics with a range of features to suit any shooter.  However, when it gets down to choosing models, it can be a confusing situation. 

There are no cut and dry answers to which scope you should choose.  The most basic question to answer is, does the scope fit your needs and deliver your expectations?  You should choose your scope based on those qualifications.

In this case, we are looking at the Sig Sauer Romeo 4 vs Romeo 5 red dot scopes.  The Romeo4 and Romeo 5 optics sit in the mid-range of Sig Sauers red dot sight lineup.  While surprisingly similar on the surface, when these two scopes go side by side, you find some interesting differences that could affect your scope purchasing decision.

Sig Sauer Romeo 4 – Bringing Sunshine into the Mix

Sig Sauer Romeo4S

One of the problems with many red dot sights is battery life.  Being what they are, red dot sights depend on a power source to illuminate the red dot reticle.  If the battery dies, in most cases, the red dot scope is useless.  Keeping your scope running and operable makes the discussion of battery life on a red dot scope a focus for many shooters.

The job of any scope is to gather light and transmit that light to the shooter’s eye.  Sig Sauer has taken the concept of gathering light a step further.  The Sig Sauer Romer 4 incorporates a small solar cell array on the scope that extends the battery life.  Under the right conditions and uses, this solar capability can double the standard battery life on a Sig Sauer Romeo 4 to 100,000 hours.

Sig Sauer Romeo5

The Romeo5 red dot sight doesn’t include the solar cell technology of the Romeo4 sight.  What you do get is options on the battery style that powers your Romeo5 red dot sight.  The Romeo5Dr and the Romeo5X use AAA batteries.  A standard CR2032 battery powers the Romero5 in a side-loading configuration for quick and easy battery changes. 

Speaking of Sub-Models – Subtle Differences Are Important

Each of the Sig Sauer further identifies its Romeo4 and Romeo5 red dot scopes by sub-categories.  These sub-categories identify other small features and details included as part of the red dot scope package.  Looking at the sub-categories for each model and the different features can give you a much better feel for which scope will meet your needs in the long run.

The Sig Sauer website only lists three sub-models as of the writing of this article.  The three models of the Romeo4 optic.  However, each sub-model has further options.  These other differences bring the total model choices to seven.

Model Identification Power Source Reticle Selection Objective Lens Size
Romeo4H Battery Only 1 MOA Plex 2 MOA Dot + 65 MOA Circle + BDC 30MM
Romeo4S Battery + Solar 1 MOA Plex 2 MOA Dot + 65 MOA Circle + BDC 20MM
Romeo4T Battery + Solar 1 MOA Plex 2 MOA Dot + 65 MOA Circle + BDC 20MM
Romeo5XDR Battery Only Circle Dot Dual Reticle 20MM
Romeo5X Battery Only 2 MOA Red Dot 20 MM
Romeo5 (high mount only) Battery Only 2 MOA Red Dot 20 MM
Romeo5 TREAD Battery Only 2 MOA Red Dot 20 MM
Romeo5 AAA or CR2032 depending on sub-model 2 MOA Red Dot 20 MM

The Question of Aiming and Dot Size

When aiming with a red dot sight, the dot’s size can often be a critical element in accuracy.  A 2 MOA red dot will appear to cover 2 inches of your target at 100 yards.  If we assume that 100 yards is about the maximum distance anyone shoots a rifle equipped with a red dot sight, you can understand the significance a 2 MOA red dot can have on accuracy.

Getting your Romeo red dot sight to zero is critical.  The reticle’s travel with each click of the turret and the total travel gives an idea of how well you can adjust the red dot sight for accuracy.

Model Dot Size Travel per Click Total Windage Adjustment Total Elevation Adjustment
Romeo4H 2 MOA 0.5 MOA 100 MOA @ 100 yds 100 MOS 2 100 Yds
Romeo4S 1 or 2 MOA 0.5 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds
Romeo4T 2 MOA 0.5 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds
Romeo5XDR 2 MOA 1.0 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds
Romeo5X 2 MOA 1.0 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds
Romeo5 (high mount only) 2 MOA 1.0 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds
Romeo5 TREAD 2 MOA 1.0 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds
Romeo5 2 MOA 1.0 MOA 100 MOA @ 100 yds 100 MOA @ 100 yds

Reticle Style and Battery– A Personal Preference to be Considered

The style of reticle you prefer in a red dot sight is purely a personal preference.  Many shooters prefer a single red dot while others find that a circle or holds on the reticle allows faster target acquisition.   In any case, Sig Sauer makes it possible for a shooter to find the right combination of a dot, circle, holds to fit their preference.

The Differences in Reticles

To eliminate any confusion, a quick rundown of each of the different components of a red dot reticle available on Sig Sauer Romer sights may be useful. 

  • Red Dot – A single illuminated red dot as the only aiming point in the scope.  Red dot only sights are effective on almost any type of firearm, including shotguns.  The effective range of most red dot sights is 100 yards or less.
  • Circle – Many red dot sights, including some of the Sig Sauer Romeo models, offer a dot and circle reticle configuration.  The red dot appears inside a circle.  Having the circle can be an aid in distance estimation as well as helping faster sight acquisition.
  • Holds – Holds are small lines representing vertical and horizontal aiming points on the reticle with the red dot centered between them.  On a circle and dot style reticle, the lines will appear in small breaks in the circle.  Holds are valuable in range estimation and sight acquisition.

Other Reticle Considerations

There are other considerations when choosing the style of the reticle in a red dot sight.  Illumination and night vision compatibility is important for some shooters, as is the number of illumination intensity settings.  Battery life also plays a role in reticle selection.

Model Reticle Colors Illumination Settings Battery Battery Life
Romeo4H Green or Red 10 daytime/2 NV CR2032 50,000 Hours
Romeo4S Red 10 Daytime/2 Nv CR2032 100,000 Hours
Romeo4T Red 10 Daytime/2 NV CR2032 100,000 Hours
Romeo5XDR Red 8 Daytime/2 NV AAA 50,000 Hours
Romeo5X Red 8 Daytime/ 2 NV AAA 50,000 Hours
Romeo5 (high mount only) Red 8 Daytime/2 NV CR2032 40,000 Hours
Romeo5 TREAD Red 8 Daytime/2 NV Cr2032 40,000 Hours
Romeo5 Red 8 Daytime/2 NV AAA or CR2032 AAA – 50,000 hrs. Cr2032 – 40,000 hrs.

MOTAC – Motion Activated Illumination

One of the keys to long battery life in the Sig Sauer Romeo4 and Romeo5 red dot sights is the MOTAC battery management system.   Simple in concept, the MOTAC system constantly monitors the status of your rifle.  If the rifle is at rest and quiet, the MOTAC system powers down the Romeo red dot sight.  At the first movement, the Romeo red dot sight is activated and ready for use.

The MOTAC system is especially effective in those Romeo models that use AAA batteries for power.  AAA batteries have a reputation for short life when used in optical systems.  The MOTAC system helps prolong the life of AAA batteries.  The cutting edge technology of the MOTAC system also ensures that the red dot will be there and ready before you get your rifle to your shoulder.

The Specification Side for the Technically Inclined

Some more technically inclined shooters want to understand the technical specifications of any product they purchase.  There is some truth to wanting this information at your disposal when trying to make final decisions about which optic is right for you.  Because the Sig Sauer Romeo line of scopes share so many features, the technical specifications are close in many places.

  Romeo4H Romeo4S Romer4T Romeo5XDR Romeo5X Romeo5HMO Romeo5Tread Romeo5
Length 86MM 85.5MM 84.7MM 63.5MM 63.5MM 62.7MM 62.7MM 63.5MM
Width 46.2MM 46MM 49MM 35.6MM 35.6MM 38.1MM 38.1MM 35.6MM
Height 63.5MM 63.5MM 67.9MM 66MM 66MM 38.6MM 38.6MM 66MM
Weight 7.6 oz 7.6 oz 7.6 oz 5.6 oz 5.6 oz 5.1 oz 5.1 oz 5.6 oz
Water Proofing IPX7 IPX7 IPX8 IPX7 IPX7 IPX7 IPX7 IPX7

What’s on the Street About the Romeo 4 and 5 Red Dot Scopes

Other users are sources of valuable information about the quality, features, and optics performance in general.  Listening to other users is particularly valuable when it comes to satisfaction with a product.  Every product has its supports and detractors. 

The Sig Sauer Romeo4 Line – The Pros

  • The solar power features extend battery life and make this a feature worth the price.
  • Designed and built for modern semi-automatic weapons but also works well on pistols and shotguns
  • The aluminum housing is strong and machined from the highest grade of aluminum alloy
  • The Romeo line is a feature-rich line of red dot optics
  • The Romeo 4 line of Sig Sauer optics includes transparent lens covers
  • Four reticle options make the Romeo4 a versatile choice in red dot optics

The Sig Sauer Romeo4 Line – The Cons

  • Some of the most expensive Sig Sauer red dot optics available
  • Only two night vision settings can be limiting

Sig Sauer Romeo5 – Pros

  • A less expensive option than the Romeo4 for those on a budget
  • High-quality construction for long and dependable life
  • Fog proof and waterproof
  • Includes a Picatinny rail adapter
  • Multiple battery options
  • Motion Activated Illumination system (MOTAC) preserves battery life

Sig Sauer Romeo5 – Cons

  • No solar power options
  • Less battery efficient than other models in the Romeo line

The Final Opinion

You won’t go wrong choosing either of the red dot optics for your rifle, shotgun, or pistol.   The Romeo4 and Romeo5 are both fine optical systems.  Personal preference becomes a huge factor when two optical systems like the Sig Sauer Romeo 4 and Romeo 5 come so close in so many ways yet offer such significant differences in their features.

Your preference may be in longer battery life.  The solar power capacity of the Romeo4 line will certainly be attractive if battery life is an issue for you.  The choice of battery style may also make a difference.

Reticle choice is primary for some shooters.  Having the style of reticle you prefer to shoot and that matches the shooting you do makes an important part of your decision.

Finally, is the price.  The more features you want and the level of technology these features require almost always translate back to the red dot optic cost.  Deciding on the compromise of cost and features is almost always one of the most difficult decisions.

My Final Choice

In the end, my choice of Romeo4 and Romeo5 models is the Romeo4S.  For me, the exceptional battery life, coupled with the solar charging capability and the available 1 MOA Plex reticle option, stands out.  The Romer4S is one of the more expensive models in the Romeo4 and Romeo5 line, but I think the cost difference is more than worth what you get.

I hope that this review of the Sig Sauer Romer4 and Romeo5 red dot models helps you as you make your decision about which optic to mount on your firearm.  If you have any further information, experience, or would just like to share your thoughts, please leave a comment in the section below.  Sharing knowledge is the idea, and everyone benefits from what you share. Be safe and shoot well.


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