Sig Sauer Tango 4 Review

Sig Sauer SOT41001 TANGO41-4 x 24mm
Sig Sauer SOT43104 TANGO43-12 x 42mm
Sig Sauer SOT41002 TANGO41-4 x 24 mm
Sig Sauer SOT41003 TANGO41-4 x 24 mm
Sig Sauer SOT44001 TANGO44-16 x 44 mm
Sig Sauer Tango4 SOT461046-24 x 50mm
Sig Sauer Tango4 Riflescope - SOT441144-16 x 44mm
Sig Sauer Tango4 Riflescope - SOT461136-24 x 50mm
Sig Sauer Tango4 Riflescope - SOT441114-16 x 44mm
Sig Sauer SOT44104 TANGO44-16 x 44mm
Sig Sauer Tango4 Riflescope - SOT461126-24 x 50mm
Sig Sauer SOT41101 TANGO41-4 x 24mm
Sig Sauer Tango4 Riflescope - SOT461116-24 x 50mm
Sig Sauer Tango4 Riflescope - SOT441134-16 x 44mm

The Sig Sauer Tango 4 provides solid features and while it is not the expensive brother the Tango6 it does deliver exceptional quality of performance. In this review, I look at the 4-16x44mm and selected the model with MOA knobs and the MOA reticle.

ModelMagnificationObjective Lens Dia.Illuminated
TANGO4 1-4x24 mm1-4mm24mmYes
TANGO4 4-16x44 mm4-16mm44mmYes
TANGO4 6-24x50 mm6-24mm50mmYes


The Tango4 model range comes with 4x times optical zoom with illumination in a 30mm one-piece aluminum tube. The lenses are made from Low dispersion (LD) glass that delivers excellent optical clarity for all situations and environments.

This scope delivers in the first focal plane (FFP) with multiple, illuminated reticle options and comes with the Sig MOTAC™ (Motion Activated Illumination) which saves on battery life but more importantly allows you to rest the scope without missing out on a shot. Obviously this model comes with quality waterproof features and is IPX-7 rated for submersion up to 1 meter, and it is very much fog-proof. The other nice feature I found is the LockDown™ Zero System which gives a resettable zero, zero-stop and auto-locks down at zero.


OK, so now I have gone through the features, let’s take a look at the scope in action. I will also take this moment to introduce myself to my new readers. I have over 30 years of combat experience as well as being a competitive shooter and hunter. I like to test every new device that comes out on the market and have made over 300 different test reviews over the last decade.

Basic Features in all models:

  • Reticles: Horseshoe 5.56/7.62 BDC / Horseshoe .300blk BDC / MIL / MOA
  • Focal Place: FFP First Focal Plane
  • Tube Diameter: 30mm
  • Battery: CR2032
  • Illumination settings: 8-day 2-night vision with on/off by each setting
  • Waterproof: IPX7
  • Turrets: LockDown Turrets, with turret rotation counter, resettable zero, zero stop, and auto-locks down on zero

Tango 4 Review

Tango 4

The first thing I noticed when opening the box of the Tango4 was its color, it’s matte grey, just like the Tango6, which is great. The box comes with all the paperwork, including the instructions. The accessories include a standard battery, and the various Allen wrenches used to make knob adjustments and zero stop. The lens caps you get as a standard are slim ones, so if you want a sunshade and flip-up caps you will need to spend extra. This model is manufactured in the Philippines factory.

Eye Piece

The Tango4 comes with an oversized eyepiece (ocular lens housing) and is actually larger than most other scopes you find on the market. The eye interface is rubber which extends about .25” outwards, and this makes for very comfortable support. This rubber ring has some knurling on it, that makes it easier for me to adjust the dioptre, as well as gives the fingers a firm grip. The fast focus design built into the eyepiece allows you to cover the whole dioptre adjustment in 1.5 full turns (revolutions). The actual movement is smooth, with only slight resistance and is supported by a small green indicator line. Essentially, this is a very solid mechanism, as I found with all the other operating parts.

Tango 4

The front of the eyepiece gives me the power selector ring, the number in the name; 4 means that this scope gives 4 x magnification levels, ranging from 4x up to 16x. The power adjustment ring also has knurling and gives excellent smooth with good grip performance. I noticed that there were two highly visual green dots on either side of the power selection indicator number, this was put there to make it easy for the user to see what magnification is set. Overall, the power selector ring is excellent and covers the range in half the circumference of the eyepiece.

Tube & Knobs

The tube is 30mm of machined aluminium, anodized and finished in a matte grey. The scope ring has a 1.9” space for mounting. The elevation knob (turret) is .5” high and has a smart rotation indicator system in place which shows the number of rotations from the bottom that the elevation is set to. This indicator has a range of 0 to 7, where each rotation has an adjustment of 12 MOA. I turned the knob to the bottom of the range and hit a solid stop, and then twisted it all the way up to the top of the range and noticed how the indicator mark rose with each turn. This scope gave me 85.5 MOA with 1.5 MOA past the 7th rotation. The elevation knob has some knurling, and it clicks as you turn it, the overall feel is solid. The top of the knob has three set screws. These screws are used to slip the knob to zero when loosened.

Tango 4 tube

The windage knob is similar to the elevation knob but is slightly stumpier. This knob also provides 12 MOA of adjustment per revolution, and I found that there was an overlap beginning at 6 MOA.

There are two illumination controls, one for the reticle and one for the adjustable parallax. The dial closest to the tube is used to adjust the parallax. This control has parks from 50 yards up to 500 yards, and the final marking is for infinity. The illuminated reticle control is set above the parallax control, and it has ten positions with an off setting. Each setting has the off switch next to it, which makes this a very intuitive control, allowing you to switch the illumination off without having to dial through a range. What I liked was the IR setting, and it provided enough night vision options for me to enjoy.

Tango 4

The scope continues from these knobs and controls for 2” (used for mounting the forward scope ring) and then hits the bell housing that holds the objective lens. The objective lens is 44mm, and this is small when considering other options. With this said, the quality of the lenses is actually far more important in delivering brightness and clarity than the size of the lense. This 44mm lens size enabled me to mount the scope lower on the rifle, and also makes the scope lighter and more compact.


The reticle is located on the first focal plane in all Tango4 models. The reticle is a standard one with hash marks indicating the number of MOA for range finding. Each mark delivers 2 MOA, the reticle has a small opening in the middle with a dot. I also found that there were even finer 1 MOA hash marks in two locations, which allows for even finer scoping.
The reticle is sized well, provides a nice and effective view when set to the max 14x as well as at the minimum 4x. This is not the only reticle you can choose from, so when purchasing consider the reticle you prefer.

Tango 4

A quick review of the different reticles you can choose from.

There is a horseshoe dot BDC reticle that is designed to go with the 5.56/7.62 and another one for the .300 Blackout and a standard MRAD/MOA reticle in FFP

Range Finding

The optics are excellent, the reticle is in place and now its time for me to dial in a shot. The fast-focus eyepiece serves well, and just note that this is not a scope for short-range work, so anything from 50 yards and outwards will be acquired with ease. The clarity of the picture I got from this scope was really good, and there was no fogging or wobble or hazing. The colors were clear, the picture was crisp, and the overall visual feel was excellent.

Tango 4

To test this scope, I used a solid Remington 700P and mounted the scope with a set of Leupold Mk4 30mm medium height rings. This allowed me to set it low, and I also used a TacOps cheek pad for more stability.

The shooting was done on a standard day, the temperature was around 45F, and it was overcast, wind was slow. I performed an initial zero, then did a box test which all worked well. The results were excellent with good groupings that measured 21.2″ apart. Since we performed a 20 MOA at 100 yards test, where 20.94″ is the difference we were seeking, the 21.2” equals a divergence of 1.2% in the adjustment size. Anything under 3% error is considered a good score, so this scope delivers.

After completing the box tests and 20MOA testing, I went on to test the reticle drift, which is done by dialling through an entire zoom and parallax adjustment. This test is done by using a grid-style bore sighting device that is mounted to the rifle muzzle. I then align the reticle to one grid point and start to dial through. The Tango4 did not provide any drift, and this is impressive when considering that most models can’t even perform such a test. I also noticed that the parallax was drift-free, which is impressive again.

Tango 4

Considering that the tests were done in a controlled environment using sandbags for support, it was time to test the scope in a more unfriendly condition. The final test was endurance, in this test I took the scope up into the mountains for a small field test. I basically took out over 200 shots while changing elevation, windage and brightness as well as occasionally knocking the rifle around. The scope handled the pressures with ease, and there was no misalignment, no internal wobble, and the knobs maintained their smooth operational performance. Considering that the rifle was dropped a few times by accident on purpose and that the occasional thump next to a tree, or drag on the ground, but not combat level, more lugging level, the scope handled itself very well and proved to be a consistent provider of solutions.


The Tango4 is an exceptional scope for the price, its true value for money and you get wonderful performance features which is what you expect from a Sig Sauer. In terms of overall range, this is a long shot scope not suited for short ranges, so if you are going to shoot from zero to 50 yards, this is not going to help you. Anything out from 50 yards up to 500 yards is well within this scopes range, and the rest depends on the quality of the user behind the scope. With this said, this is an excellent range and competition scope, with hunting, the only area I would consider getting the Tango6 instead of the Tango 4 would be in mountainous areas. Trying to acquire a quick shot uphill with a 3.3” eye relief can lead to some black eye, apart from that issue, this is an excellent scope.

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