Sig Sauer Romeo 4 vs Romeo 5

Sig Sauer introduced the Romeo 4, 5 and 7 to the market at the same time, and each one was different to the other and offered specific features for the user to consider when selecting a scope.

Obviously there is more to them than just these two factors, but when comparing the two I found that it was like comparing apples and oranges; they are essentially two different devices sharing the same model name. There are similarities, but the bottom line showed that the Romeo 5 was just a basic compact model of the Romeo 4.

OK, so now you know they are different, but it really boils down to the fact that the Romeo 5 is the baby brother of the robust Romeo 4. Now, let’s take a closer look at both scopes.

ItemMagnificationObjective Lens DiameterAdjustmentsBattery Life
Sig Sauer Romeo 41x20mm0.5 MOA Click100,000 hours
Sig Sauer Romeo 51x20mm2 MOA50,000 hours

A comparison between Sig Sauer Romeo 4 vs Romeo 5

Sig Sauer Romeo 4

Sig Sauer Romeo 4


The Romeo4 is Sig Sauers all-in-one 1x sight that comes with all the bells and whistles. This model is designed to sit on anything that shoots and is the ultimate solution for short to medium range targets. The body is an aluminium alloy that comes with a true co-witness QR mount and low mount.

The features you get include the Sig Sauer MOTAC (Motion Activated Illumination) which powers down the sight when the weapon is not moving, and powers up when the sight detects a vibration through the mount. The MOTAC system increases the battery life to over 100,000 hours, and since this model is the all-inclusive one, it comes with solar power for daytime and battery power for low lighting and night time use.

The Romeo4 comes with lens covers and has four reticle options produced from their Ballistic Circle-Dot and the Ballistic Circle QuadPex reticle. The four options include Dot, Circle-Dot, Dot with Holds, Circle-Dot with Holds. You also get unlimited eye-relief, and it is obviously waterproof to IPX-7 and fog-proof. The Romeo4 is the top line of the Romeo models that Sig Sauer produces and is priced accordingly.

Sig Sauer Romeo 5



The Romeo5 is a compact red dot sight that incorporates most of the best technologies that Sig Sauer can offer. This 1x sight is fabricated using resilient aluminium alloy and provides an IPX-7 waterproof rating. It is also designed to be fog-resistant and is tough in rough and ready environments.

The sight uses a CR2032 sideloaded cell for illumination, and you get 8 brightness levels for daytime and 2-night vision levels. It also comes with their MOTAC™ (Motion Activated Illumination) system that powers down after 10 minutes of no movement and then powers up immediately when sensing a vibration or movement. The reticle is their standard 2 MOA red-dot, and the whole base sits on an Integrated M1913 Picatinny interface, so you can mount it on just about anything. You also get an M1913 Picatinny low mount riser as well as a co-witness 1.41” riser mount.

The Romeo5 as the compact model is the least expensive in the Romeo range, so it’s a bit unfair to compare it to the top of the range, but heck, I was asked to compare, so I am.


Well, to start off with, the Romeo4 is larger, bulkier and holds more tricks than the smaller, compact Romeo5. Both provide quality performance, but the Romeo4 gives you a wider selection of reticles to choose from. The solar-powered Romeo4 also extends the life of the battery to over double that of the Romeo5, although both use the MOTAC system to power down and up when the weapon is not in use. The Romeo4 gives you the ability to adjust your sight with 0.5 MOA clicks, the Romeo5 is set, you get it, you use it, and that’s it.

When it comes to hands-on performance, both provide equal quality. The knobs are easy to rotate, the mount is secure and does not wobble or degrade even when putting the weapon through some extreme situations. The body is robust, both are made from the same aluminum, so both provide equal rugged performance.

OK, let’s start off with actual performance. Both Romeo’s mounted easily, both have similar design features (obviously since they are both from Sig Sauer and share the same model brand). Both have exceptional power performance, while the Romeo4 outperforms the Romeo5 by offering solar power which doubles the life expectancy of the battery.

The Romeo4 reticle selection is great, and this allows you to be more practical for different shots, while the Romeo5 is really designed for a fast, close to middle combat situation offering only one reticle that is designed for instinctive shooting rather than actual range finding.

The Romeo4 and the Romeo5 offer the MOTAC shake awake technology. Both also perform excellently in cold and hot weather as well as underwater. Neither of them fogged up, and both of them withstood some seriously extreme handling, in some instances falling onto a concrete floor, being banged into a wall or a window frame, and of course, withstanding multiple repercussion shots, in some instanced with killer recoil.

The Romeo5 is a small body sight, and is great for quick action while the Romeo4 is for both fast and slow action, hunting and middle-range sighting is great with a Romeo4, especially in low light conditions.


It comes down to budget, The Romeo4 provides more coverage and features and is well worth the cost. The Romeo5 is a smaller, more compact and simpler version of the Romeo4. The bottom line is this; do you need both? Maybe you do, but if you can only afford one, then try to get the Romeo4, it gives you so much more than the Romeo5. Now for the clincher, there are different sub-models in each range; the Romeo4 comes with a price range that nearly doubles from its simpler version the ROMEO4DR 1×20 mm to the top of the line version ROMEO4T 1×20 mm. The Romeo5 comes in three variants, but they are priced similarly, with only the ROMEO5 1×20 mm (high mount only) coming in at only $20 cheaper than the other two variants.

To be honest, buying both is actually not a bad idea if you need two sights, having a similarity of operation is always useful in the field, so the Rome5 might be a great sight for a smaller firearm, while the Romeo4 could be perfect for your AR’s.

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