The Reptilia DOT Mount is a one-piece Picatinny optic mount for the Trijicon MRO, holding the optic at Reptilia's 39mm lower 1/3 height, which the trade lists as 1.54in bore height.
The MRO at the classic co-witness height, on 43 g of billet aluminium with nothing in it that adjusts.
Machined from billet 7075-T6 aluminium with a Milspec Type III hard anodised finish, the DOT Mount attaches to any M1913 Picatinny rail and offers lower 1/3 co-witness with standard AR-15 back-up iron sights. Its spring-loaded nitrided steel clamp and mounting bolt sit flush with the body of the mount for a low-profile, anti-snag design, and mounting screws and a hex L-key are included.
39mm is Reptilia's own figure and comes out at 1.535in, which is why dealers list it as 1.54in bore height — the same mount, quoted two ways. At that height the MRO's large window sits over your irons rather than in front of them, so a UK straight-pull AR-15 keeps a usable backup without a taller mount and a taller cheek weld. Made in the USA.
Why shooters choose the Lower 1/3 DOT Mount for Trijicon MRO
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39mm / 1.54in bore height — lower 1/3 co-witness with standard AR-15 back-up iron sights
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Cut for the Trijicon MRO — one footprint, mounted direct, with no adapter plate under the optic
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43 g (1.5 oz) — billet 7075-T6 aluminium, Milspec Type III hard anodised
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Spring-loaded steel clamp — nitrided steel, flush with the body, nothing proud to snag
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Fitting kit included — mounting screws and a hex L-key come in the box
What the Lower 1/3 DOT Mount for Trijicon MRO fits
Fits the Trijicon MRO, on any M1913 Picatinny rail including the flat-top upper of a UK straight-pull AR-15. Footprint and height are both fixed: MRO footprint, Reptilia 39mm (1.54in) lower 1/3 height. If you want the head-up sightline instead, the 1.93in MRO DOT Mount is the same footprint at the taller height. An Aimpoint Micro, ACRO or RMR uses a different pattern and will not fit this mount.
Specifications
| Platform |
AR-15 / M4 |
| Fits |
Trijicon MRO, on any M1913 Picatinny rail |
| Type |
One-piece red dot mount — 39mm (1.54in) lower 1/3 bore height |
| Material |
Billet 7075-T6 aluminium; nitrided steel clamp |
| Finish |
Milspec Type III hard anodised — Black Anodized |
| Weight |
43 g (1.5 oz) |
| Mount interface |
Spring-loaded clamp to M1913 Picatinny |
| Made in |
USA |
| Brand |
Reptilia |
| MPN |
100-022 |
Big window, low sightline, irons still in the picture. Order the Lower 1/3 DOT Mount for Trijicon MRO today — in stock at Xtreme Tactical Gun Parts with free tracked UK delivery in 7–10 days.
Explore more: AR-15 Parts & Accessories, Scope Mounts & Optic Risers or browse all Reptilia.
