EOTech G43 Magnifier Review

The G43 is a compact 3x magnifier on a switch-to-side mount. The manual gives real numbers for weight, eye relief and torque, and they tell you who it suits.

Start with the number on the scale

Magnifier reviews usually lead with how crisp the picture is. EOTech's own manual supports a different starting point: the G43 weighs 11.3 ounces (320.3 grams). For comparison, Sig lists its Romeo5 Gen II rifle dot at 5.5 ounces. The magnifier alone weighs a bit more than twice what a popular compact dot does. That is not a flaw, but it is the biggest practical fact about the G43, and it should shape whether you want one.

This is an editorial review based on EOTech's published manual and product page. We have not handled or fired the product, so we will not describe the look of the glass. The manual does not publish lens coating or light transmission data, so we will not guess at it either.

The documented specifications

The manual lists the product as designed to sit behind EOTech holographic weapon sights, and says it works with all HWS models. It does not make compatibility claims about other brands of red dot. If you plan to pair it with a non-EOTech sight, treat it as your project: optical axis height and spacing have to line up, and the manual's mounting steps assume EOTech's own sights.

The STS mount is the point

The G43's defining feature is the switch-to-side mounting system. You push the magnifier toward the side it is mounted on to swing it out of the way, and push it back until it reaches a hard stop to bring it into the sight picture. That is what makes a dot-and-magnifier rifle appealing: 1x with both eyes open for close work, a quick flip to 3x when you want to identify or hit something farther away.

The manual shows the mount can be configured to flip left or right, so you can choose the side that stays clear of your charging handle and the rest of your rail. It also describes a quick-detach lever, and warns never to make adjustments while the quick-detach lever is in the closed position.

For the installation steps, the manual says to seat the mount behind the HWS, press the locking button and swing the lever open, push the magnifier forward until the cross bolt enters the slot, and close the lever. If the fit on your rail is loose, you open the lever and turn the adjustment dial in small steps, remounting and repeating until the fit is right.

Height, spacers and the 24 inch-pound number

Height is where magnifier setups go wrong, and EOTech's manual is clear about the mechanics. The mount can place the magnifier at either an absolute or lower-third co-witness height, and a 7 mm riser is used with HWS models that have side buttons or quick-detach levers. Models with rear buttons should not use it. The manual calls for shorter screws without the riser and longer screws with it, and it says that if you use a torque wrench the clamp screws should be tightened to 24 inch-pounds.

The manual does not publish a numeric optical center height. If you are mixing brands, you will need your sight's published height and a fit check by eye. Our co-witness guide explains absolute and lower-third and why the reference heights differ.

One more instruction deserves emphasis: the manual says to re-zero the HWS after installing the magnifier. Our setup guide treats the magnifier as non-impacting on zero if it is aligned, which holds once the sight is properly zeroed. The takeaway is to confirm your zero with the magnifier on the rifle, not assume it.

Eye relief of 2.5 inches

With only 2.5 inches of eye relief, you cannot hang the magnifier out at arm's length behind the sight. Mounting position is a fit exercise: place it where you get a full picture with your natural cheek weld, in the shooting position you use, not at a bench. A small shift in head position will clip the image. That is simply how magnifiers behave, which is why many shooters keep it flipped to the side for close work.

The manual includes a diopter adjustment: grip the diopter with thumb and forefinger and turn until the picture is clear. EOTech notes that magnification may change slightly while you adjust. Set the diopter with the eyewear you will actually shoot in.

Reticle centering is also user adjustable with simple controls on the top or side. The manual says this is cosmetic and does not affect zero, which means centering the dot within the picture does not move your point of impact. Use it to tidy the sight picture, not to chase zero.

Cleaning and care

EOTech says to never wipe the glass dry and to use only water-based cleaners, avoiding solvents, gun cleaners and lubricants. It also warns never to disassemble the magnifier, noting that doing so voids the warranty and damages the unit. These are model-specific instructions, so treat the manual as the authority.

Weight is the argument against it

At 11.3 ounces, the G43 adds a noticeable load at the front or middle of a rifle's rail. If you build a lightweight carbine, that weight may bother you more than a missing 3x. The alternative is a low-power variable optic, which puts a magnification range in one tube; our LPVO versus dot-and-magnifier comparison explains the trade. BuyMoreGuns also covers the broader choice in LPVO versus red dot versus prism. A simple, lighter option is to skip magnification entirely and use a red dot; that is a legitimate answer if your shooting is mostly within 100 yards.

Who it suits

• Suits: shooters already running an EOTech holographic sight who want to add a 3x on a rail; builders who value a flip-to-side magnifier over a variable optic; rifle owners for whom weight is a secondary concern.
• Skip if: your rifle is already heavy and you want one optic; you have a non-EOTech dot and are not prepared to fit height and spacing; or you want documented glass or coating details before you buy.

Check current price and availability for the EOTech G43 Magnifier, confirm that the STS variant and color are what you want, and compare the mount height against your sight. To see other options, browse the optics category at Ammunition Depot.

Editorial note: This is an independent editorial overview built from manufacturer specifications and publicly available information. We have not performed hands-on testing of the products discussed, and nothing here is a performance guarantee. Verify specifications, compatibility and legality for your own situation.

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