Holosun HE509T X2 Red Dot Sight Multi-Reticle System – HE509T-RD-X2

The Holosun HE509T X2 Red Dot Sight (HE509T-RD-X2) is a 1x fully enclosed pistol red dot sight in a nitrogen-purged Grade 5 titanium housing on the 509T footprint, with the Multi-Reticle System — a 2 MOA red dot, a 32 MOA circle, or both together as a circle-dot. An RMR-to-509T adapter plate is included.

This is about as tough as a mini reflex sight gets. The emitter is sealed inside the housing and the interior is nitrogen-purged, so rain, mud and dust never reach the LED and the glass does not fog from the inside. Grade 5 titanium takes the impact loads. Solar Failsafe supplements the CR1632, Shake Awake sleeps the reticle when the pistol is still, and Lock Mode stops the settings being changed by accident, for up to 50,000 hours of runtime.

How It Compares

The same optic is available in HE509T X2 green and HE509T X2 gold. For an open-emitter titanium optic on the RMR footprint, see the HE508T X2 red dot sight; for an open-emitter aluminium one, the HS507C X2 red dot sight. To put it on a rifle or shotgun rail, the 509T Picatinny mount at 1.63 in lower 1/3 and the 509T Picatinny mount at 0.82 in low profile are the two heights, and the 509 mounting plate for Glock MOS 9mm covers optics-ready slides. Browse every enclosed red dot sight we stock.

Ideal For

• Section 1 long-barrelled pistols and revolvers held on a UK firearm certificate
• All-weather outdoor use, where a sealed emitter keeps the dot clear
• Practical shotgun and pistol-calibre carbine builds using a 509T Picatinny mount
• Airsoft GBB pistol builds that take a beating on wet sites

Key Features

• Housing: Grade 5 titanium, fully enclosed and nitrogen-purged
• Reticle: red Multi-Reticle System — selectable 2 MOA dot, 32 MOA circle, or circle-dot
• Footprint: 509T footprint, with an RMR-to-509T adapter plate included
• Illumination: 12 brightness settings — 10 daylight and 2 night-vision compatible
• Electronics: Solar Failsafe supplemental power, Shake Awake and Lock Mode
• Battery: CR1632, up to 50,000 hours of runtime
• Magnification: 1x, parallax-free

Technical Specifications

What's Included

• Holosun HE509T-RD-X2 enclosed red dot sight
• RMR-to-509T adapter plate
• Multi-tool, lens cloth and user manual

Warranty

Covered by Holosun's manufacturer warranty, handled in the UK by Xtreme Tactical.

UK Delivery & Support

UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Holosun's warranty.

Frequently Asked Questions

What footprint does the Holosun HE509T X2 use?
The Holosun HE509T X2 Red Dot Sight uses the 509T footprint, which is its own pattern rather than RMR or RMSc. An RMR-to-509T adapter plate is included in the box, so it can also be fitted to RMR-cut slides and RMR-pattern mounts.

Will the Holosun HE509T X2 fit an RMR-cut slide?
Yes, using the RMR-to-509T adapter plate supplied with the optic. Without that plate the Holosun HE509T X2 mounts only to the native 509T pattern.

Is the Holosun HE509T X2 fully sealed?
Yes. The Holosun HE509T X2 has a fully enclosed emitter in a nitrogen-purged Grade 5 titanium housing, so rain, mud and dust cannot reach the LED and the glass will not fog internally.

What reticle options does the Holosun HE509T X2 have?
It uses the Multi-Reticle System, which switches between a 2 MOA red dot on its own, a 32 MOA circle on its own, and both together as a circle-dot.

What battery does the Holosun HE509T X2 use?
The Holosun HE509T X2 runs on a CR1632 cell. With Solar Failsafe supplementing it from ambient light and Shake Awake sleeping the reticle when idle, Holosun rates the runtime at up to 50,000 hours.

How is the HE509T X2 different from the HE508T X2?
Both use Grade 5 titanium housings, but the Holosun HE509T X2 has a fully enclosed, nitrogen-purged emitter on the 509T footprint, while the HE508T X2 is an open-reflex optic on the Trijicon RMR footprint.