Description
The Holosun 509T X2 Green FDE is an enclosed pistol sight with a titanium housing, a green Multi-Reticle System and a Flat Dark Earth finish that matches FDE frames and slides. It is one of the toughest pistol optics Holosun makes, built for duty, home defense and hard everyday carry.
Holosun 509T X2 Green FDE Overview
Where most pistol optics use aluminum, the 509T body is grade 5 titanium, which shrugs off impacts that would dent or crack a lighter housing. The emitter is sealed behind front and rear glass, so mud, rain and lint cannot sit on the LED. The window measures 0.66 by 0.9 inches, taller than wide, and the sight weighs only 1.27 ounces. Part number HE509T-GR-X2-FDE projects a 540nm green reticle that many shooters find easier to see in bright light than red.
Multi-Reticle System Explained
Holosun’s MRS lets you choose between a 2 MOA dot, a 32 MOA circle, or the circle and dot together, and it remembers your choice. The circle-dot is popular for defensive use because the large ring is fast to find under stress while the center dot keeps precise shots possible at 25 yards. The plain 2 MOA dot is the better choice for small targets and longer pistol distances. Being able to switch means one optic can cover both range and carry roles.
Power: Battery Plus Solar
The battery loads from a side tray, so changing it does not mean removing the optic and re-zeroing. Rated life is 50,000 hours at setting 6, helped by Shake Awake, which turns the LED off when the pistol is still and back on the moment it moves. A small solar panel on top supplements the battery in good light. Brightness can be set manually or left in automatic mode, and lockout keeps settings from being bumped in a holster.
Fitment and Plates
The sight uses its own 509T footprint, and Holosun includes an adapter plate so it also mounts on slides cut for the RMR pattern. Many factory optic-ready pistols need a separate plate to accept it, and dedicated 509T plates are available for Glock MOS, HK VP and other models. Confirm your cut before ordering. The 509T sits taller than open micro dots, so lower irons may not co-witness; suppressor-height sights are a common pairing.
FDE Finish Considerations
The Flat Dark Earth finish is a coating over titanium, and it will show holster wear at the corners over years of carry, as every colored finish does. If your pistol is black, the standard black version will match better. If your slide or frame is FDE, this sight completes the look. Color has no effect on performance; the optics, electronics and reticle are identical to the black model.
Honest Trade-Offs
The 509T is taller and heavier-looking than slim open-emitter optics, and it costs more than most aluminum enclosed sights. On subcompact carry pistols it can look oversized, and those guns are usually better served by the EPS Carry. Adjustments are 1 MOA per click with plus or minus 30 MOA of travel, which is plenty for any pistol. For a duty or home-defense handgun, the trade for toughness is worth it for many owners.
Gallery Photo Note
Holosun uses one set of FDE angle photos for both the red and green 509T X2 FDE models, so some gallery images may show a red dot. The housing pictured is identical; this model projects a green reticle.
Specifications
- Model: HE509T-GR-X2-FDE
- UPC: 810047073116
- Reticle: MRS, 2 MOA dot, 32 MOA circle, or both
- LED: 540nm green
- Magnification: 1x, unlimited eye relief
- Battery: CR1632 side tray, up to 50,000 hours
- Power features: Solar Failsafe, Shake Awake, auto brightness, lockout
- Adjustment: 1 MOA per click, plus or minus 30 MOA travel
- Housing: grade 5 titanium, Flat Dark Earth finish
- Water rating: IP67
- Window: 0.66 x 0.9 in
- Dimensions: 1.6 x 1.16 x 1.13 in
- Weight: 1.27 oz
- In the box: RMR adapter plate, screws, multi-tool, lens cloth
Before You Buy
A pistol optic is not a firearm, so no FFL transfer or background check is required and it ships directly to you. Check your slide cut and plate needs, make sure your holster accepts an enclosed optic of this height, and consider taller iron sights if you want a backup co-witness.
Who It Is For
The Holosun 509T X2 Green FDE is a great fit for owners of full-size and compact duty pistols in FDE who want a nearly indestructible enclosed optic with a fast circle-dot reticle for defense and a precise dot for the range.
Buy the Holosun 509T X2 Green FDE at MAG5 Firearms
MAG5 Firearms is a family-owned shop in Collegeville, Pennsylvania. Optics do not require an FFL transfer, so the Holosun 509T X2 Green FDE ships straight to your door. Browse our full selection of red dot sights for more pistol optics. For factory details, visit Holosun.
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