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    Holosun 509T X2 Review - The Most Durable Enclosed Emitter Pistol Red Dot Sight

    Holosun 509T X2 Review - The Most Durable Enclosed Emitter Pistol Red Dot Sight

    Hey Freedom Gorillas, today we are going to talk about the Holosun 509T X2. This is one of the toughest enclosed emitter optics on the market due to its Grade 5 Titanium Housing.

    We understand that not having these optics in front of it can make it difficult to decide which to get. With this review article we aim to give you more information to help you make the right decision for your use case.

    The 509T X2 comes in a black or FDE housing color and is available in Red or Green Dot. The red dot version is $429.99 and green dot version is $459.99.

    Holosun 509T X2 Red & Green Dot Sights FDE and Black Side by Side

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    The Holosun 509T X2 is an enclosed emitter optic that is made out of Grade 5 Titanium. The Titanium is to make it extra durable and drop proof, so it's perfect for duty use. The 509T X2 has the Holosun MRS - 3 reticle system, shake awake, long battery life with side removable battery, IP67 water proof rating, has a solar failsafe with manual and auto brightness modes, comes in red or green reticles and in an FDE or Black housing. It uses a clamping mounting mechanism and comes with an RMR adapter plate. You can find many more adapter plates for it here.

    Holosun 509T X2 Red & Green Dot Sight - Boxes FDE & Black
    Buy the 509T X2 at The Best Price

    Other quick stats and dimensions on the Holosun 509T X2 are as follows:

    • Closed Emitter Optic¬†(Read more about¬†open vs closed emitters optics here)
    • RMR Footprint Plate Included (More 509T adapter plates here)
    • MRS Reticle: 32 MOA outer ring + 2 MOA center dot (configurable)
    • 10Khrs of battery life with MRS reticle, 50K hrs¬†of battery life with 2 MOA dot only on setting 6
    • 12 Brightness Setting: 10 Daylight & 2 Nightvision Compatible
    • Manual & Auto Brightness Modes
    • Convenient Side Battery Compartment
    • Grade 5 Titanium¬†Housing
    • Solar Failsafe
    • Parallax-free & Unlimited Eye Relief
    • IP67 Waterproof
    • Shake Awake‚ĄĘ
    • Multilayer Reflective Glass
    • 1 MOA Adjustment per Click
    • CR1632 Battery
    • Window Size: .66" High, .9" Wide
    • Optic Size: 1.6"L, 1.35"H, 1.21"W
    • Weight: 2.2¬†oz (optic only)
    • Weight: 3.4 oz (optic + included RMR adapter plate)

    Holosun 509T X2 Reticles

    The Holosun 509T comes with the MRS reticle (multi reticle system) which is a 32 MOA circle with a 2 MOA center dot. The reticle can be toggled holding down the ‚Äú-‚ÄĚ button for 3 seconds so you can have a 32 MOA outer ring only, 2 MOA center dot only, or both together.

    Holosun MRS Reticle Toggle How To

    The MRS reticle is nice if you want flexibility. The larger outer ring helps you "find the dot" and the 2 MOA center dot is small and precise.

    The Holosoun 509T comes in red or green reticles. The green version is slightly more expensive.

    Holosun 509T X2 Reticle Side by Side, Red vs Green

    Holosun 509T X2 Pricing & Models

    The Holosun 509T X2 comes in red or green reticles and has the MRS Reticle.

    You can learn more about red vs green dots here.

    It comes in Red or Green Dot versions, and is available with either a black or FDE housing color.

    Holosun 509T X2 Red Dot Sight

    Holosun 509T X2 FDE Green Dot Sight

    Buy the 509T X2 At The Best Price

    Holosun 509T X2 Dimensions & Size

    Holosun 509T X2 Dimensions, Size, Weight
    • Deck height: 9.86MM (without RMR plate)
    • Width: 1.21"
    • Length: 1.6"
    • Height: 1.35"
    • Window Size: .9" Wide, .66" Tall
    • Weight:¬†2.2¬†oz (optic only)
    • Weight: 3.4 oz (optic + included RMR adapter plate)

    Holosun 509T X2 Footprint

    The Holosun 509T X2 has it’s own clamping footprint. It comes with an RMR adapter plate, and more adapter plates can be purchased here.

    Out of the box it means it will fit on an RMR footprint slide.

    *Note: The 509T X2 RMR adapter plate will not work with any "Zev Post" slides. Also if you plan on using a "plate sandwich" where you mount the RMR plate to another plate for your gun, you may run into screw length issues. Refer to the fitment table below for more information.

    Holosun 509T X2 Footprint & Adapter Plate

    Holosun 509T X2 Intended Use

    The Holosun 509T X2 is a regular sized pistol red dot. This means it is intended for use on any pistol with an RMR footprint, RMR adapter plate, or that can accept an aftermarket 509T X2 adapter plate which can be found here.

    Most of the time this means the pistol will be a full size or compact such as a Glock 19 MOS or a S&W M&P 2.0. Make sure you know what footprint your gun is. The 509T X2 is not intended for and usually will not fit any micro compact pistol like a Glock 43X MOS or Sig P365. For the smaller pistols you want to look at the EPS Carry.

    The 509T X2 can also be used as a rifle optic, PCC optic, or backup scope optic if you get a 509T Picatinny Adapter here.

    In the Holosun 509T X2 Box

    When you open the Holosun 509T X2 this is what you will find in the box:

    • 1x CR1632 Battery¬†(installed inside the optic)
    • Holosun Warranty Card
    • Holosun Battery, Screws, & Adjustment Tool
    • Holosun Manual
    • 2x 6-32 Screws (short), for mounting plate to slide
    • 509T X2 Optic
    • RMR to 509T X2 Steel Adapter Plate
    • Lens Cloth

    Holosun 509T X2 Screws & Batteries

    Here is an up close photo of the Holosun 509T X2 Screws, Battery, and Tool that come in the box. The battery will be pre-installed in the optic.

    Holosun 509T X2 Screws & Battery

    Holosun 509T X2 Fitment Info & Adapter Plates

    Below is information on mounting the Holosun 509T X2 Reflex Sight on different pistols. Some pistols require adapter plates to make it fit. The table below is for Optics Ready pistols only. If you do not have an optics ready pistol and still want to mount a 509T to your platform, you can get a dovetail mount which replaces your rear dovetail sights. Find all our dovetail mounts here.

    *Note: Clicking on the pistol name below will take your to our fitment guide which explains more about each platform.

    Anderson Manufacturing

    Arsenal Democracy

    Bul Armory



    Heckler & Koch

      Palmetto State Armory

      Shadow Systems

      Smith & Wesson

      Staccato 2011


      Wilson Combat

      • Wilson Combat 1911's¬†(will fit using the Trijicon RMR plate + the¬†included¬†509T¬†RMR Plate)
      • Wilson Combat Glocks (will fit using the Trijicon RMR plate + the¬†included¬†509T¬†RMR Plate)






        Nighthawk Custom

          Sig Sauer

          Springfield Armory


          • Stoeger STR9¬†(will fit using Stoeger RMR plate + included¬†509T RMR adapter plate)


          Don't see your model listed? Check out our Fitment Guides Here.

          Holosun 509T X2 Review & Highlights

          The Holosun 509T X2 is one of the most durable enclosed emitter pistol optics on the market. It’s built like a tank with it’s Grade 5 Titanium housing and is intended for hard duty use.

          Holosun 509T X2 Mounted on Gun, PSA Dagger, Co-Witness & Side

          It’s also one of the oldest closed emitter optics on the market. The 509T X2 has a durable Grade 5 housing, two panes of glass to protect the laser emitter from being obstructed by debris, dust, mud, or precipitation. It has an IP67 waterproof rating, come with Shake Awake, a side removable battery, has long battery life, and has a solar failsafe with both auto brightness and manual brightness modes.

          Open vs Closed Emitter Diagram

          The 509T X2 also comes in red or green reticles, has the MRS reticle, and is available in FDE or black housing colors.

          The 509T X2 uses a clamping mechanism, so you mount a plate to your optics ready slide, then clamp the optic to the plate. Many aftermarket 509T X2 adapter plates are available .. you can find many here. Getting a dedicated 509T X2 plate will allow the optic to sit lower on your slide if you have a pistol with a multi adapter plate system.

          If you need the ultra in durability then check out the 509T X2. 

          Holosun 509T X2 Red Dot Sight Holosun 509T X2 FDE Green Dot Sight

          Buy the 509T X2 At The Best Price

          Holosun 509T X2 Downsides

          The only real downside to the Holosun 509T X2 is that because of it’s clamping mechanism it has a higher than average deck height. This means in most cases you will need suppressor height sights and an adapter plate to properly co-witness with the optic.

          Holosun 509T X2 Warranty

          Holosun has a limited lifetime warranty. Basically everything is covered for the lifetime of the optic except for the electronics, that is covered for 10 years.

          We’ve dealt with Holosuns warranty department and they are easy to deal with.

          Also when you purchase from Freedom Gorilla, if you have an issue within 30 days we will replace the optic for you free of charge.


          Overall the Holosun 509T X2 is an extremely reliable, durable, and proven duty optic. Compared to others on the market, you will get the most bang for your buck with the 509T X2.

          Sometimes customers really are dead set on the 509T X2, but at times we recommend the EPS full size over the 509T X2. The EPS full size MRS is very similar to the 509T except it has a 7075 Aluminum housing, and a lower deck height.

          If you 100% need the durability of the titanium housing then by all means get the 509T X2, however if you are simply looking for an enclosed emitter, and want a better chance of co-witnessing your iron sights, we normally would recommend the EPS full size.

          If you have any further questions please reach out.

          Thanks for reading!

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