Reptilia DOT Optic Mount 1.93" for Holosun 509T
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Fits the Holosun 509T only, on any M1913 Picatinny rail. Fixed 1.93in optical axis height, not adjustable. Does not fit Holosun 507 or 508, Trijicon RMR or SRO, Aimpoint Micro, Aimpoint ACRO or Trijicon MRO.
Not sure it fits your rifle? Ask us before you order
The Reptilia DOT Mount is a one-piece Picatinny optic mount for the Holosun 509T, placing the optical axis 1.93in (49 mm) above the rail.
The 509T has its own footprint and will not sit on an RMR mount. This is the one cut for it, at the tall height.
Machined from billet 7075-T6 aluminium in a Milspec Type III hard anodised finish, the mount attaches to any M1913 Picatinny rail and holds the 509T on a dedicated interface rather than through an adapter. A nitrided 4140 steel clamp closes onto the rail, and the assembly weighs 57 g (2.0 oz).
The 509T is an enclosed-emitter dot, which is the reason a lot of British shooters pick it — the LED is sealed inside the housing, so rain and mud cannot bridge the gap and dim it. Putting it on a mount machined for its own footprint keeps the joint count down to one. Made in the USA.
Fits the Holosun 509T, including the HE509T variants, on any M1913 Picatinny rail — including the flat-top upper of a UK straight-pull AR-15. Footprint and height are both fixed: 509T footprint at a 1.93in optical axis. Standard AR-15 back-up iron sights do not co-witness at this height. A Holosun 507 or 508 uses the Trijicon RMR footprint and needs the RMR/SRO DOT Mount, not this one.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Holosun 509T, on any M1913 Picatinny rail |
| Type | One-piece red dot mount — 1.93in (49 mm) optical axis over rail |
| Material | Billet 7075-T6 aluminium; nitrided 4140 steel clamp |
| Finish | Milspec Type III hard anodised — Black, Flat Dark Earth Anodized |
| Weight | 57 g (2.0 oz) |
| Mount interface | Spring-loaded clamp to M1913 Picatinny |
| Made in | USA |
| Brand | Reptilia |
| MPN | 100-167 · 100-168 |
The 509T's own footprint, at the height you actually shoot from. Order the 1.93" DOT Mount for Holosun 509T today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: AR-15 Parts & Accessories, Scope Mounts & Optic Risers or browse all Reptilia.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Holosun 509T, on any M1913 Picatinny rail |
| Type | One-piece red dot mount — 1.93in (49 mm) optical axis over rail |
| Material | Billet 7075-T6 aluminium; nitrided 4140 steel clamp |
| Finish | Milspec Type III hard anodised — Black, Flat Dark Earth Anodized |
| Weight | 57 g (2.0 oz) |
| Mount interface | Spring-loaded clamp to M1913 Picatinny |
| Made in | USA |
| Brand | Reptilia |
| MPN | 100-167 · 100-168 |
| Category | Optic Mount |
| Barcode | 850002688511 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
Because Holosun gave the 509T an enclosed housing with its own mounting pattern rather than the open-emitter RMR geometry the 507 and 508 use. The screw positions and the recoil surfaces are in different places. There is no shim or plate that makes an RMR mount hold a 509T properly, which is why Reptilia machine a separate mount for it.
Reptilia list the 509T against this mount, and the HE509T variants share the same housing and mounting pattern. If you are running a Primary Arms-branded version of the same optic, check the base against Holosun's own 509T specification before ordering — the reticle differs, the footprint should not.
For the 509T in Reptilia's DOT range, yes — this listing is the 1.93in version and Reptilia do not publish a lower-third 509T DOT Mount. If you need a 509T low over a shotgun receiver instead of on a rail, Reptilia's SADDLE for the Beretta 1301 and A300 is a different product built for exactly that.
No. At 1.93in standard AR-15 back-up iron sights sit below the optic window rather than inside it. Treat them as a separate sighting system at this height, or choose a lower mount if seeing both at once matters to you.
Optic mounts are sent from the United Kingdom with £5 tracked UK delivery in 7–10 business days, and you'll get tracking by email when it ships. If a part turns out to be the wrong fit, see our returns policy or <a href="/pages/contact">contact us</a> and we'll help sort it.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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