The Reptilia RMU Mount 0.39in is a Picatinny riser for magnifiers, lifting a 3x or 6x magnifier in its original mount so its optical centre lines up with a red dot sitting at 1.93in.
Your dot is at 1.93in and your magnifier is at 1.54in. This is the 0.39in that closes the gap.
Most 3x and 6x magnifiers ship in a flip-to-side mount built around the older 1.54in sightline. Put one behind a red dot at 1.93in and the two no longer share an optical axis — you get a partial picture, or you tip your head to find the centre. Reptilia's answer is a dedicated riser that raises the magnifier and its own mount by exactly the difference.
It is machined from billet 7075-T6 aluminium with a Milspec Type III hard anodised finish and weighs 51 g (1.8 oz). This is not the same part as Reptilia's 0.625in RMU riser, which exists to raise a whole holographic sight — different lift, different job. Made in the USA.
Why shooters choose the RMU Mount 0.39"
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Lifts a magnifier by 0.39in — the difference between a 1.54in magnifier mount and a 1.93in red dot
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Keeps your existing mount — the magnifier stays in the flip-to-side mount it came with
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For 3x and 6x magnifiers — the sizes Reptilia publish this riser for
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51 g (1.8 oz) — billet 7075-T6 aluminium, Milspec Type III hard anodised
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Optical axes aligned — a full picture through the magnifier instead of a head-tilt to find the centre
What the RMU Mount 0.39" fits
Fits a 3x or 6x magnifier in its original Picatinny mount, on any M1913 Picatinny rail behind a red dot mounted at 1.93in. It raises the magnifier and its own mount together — it does not replace the magnifier mount. Pair it with any of Reptilia's 1.93in DOT Mounts, such as the Aimpoint Micro, Trijicon RMR/SRO or Holosun AEMS versions. If what you want to raise is a whole holographic sight with an integral base, the RMU Mount 0.625in is the other part in this family.
Specifications
| Platform |
AR-15 / M4 |
| Fits |
3x and 6x magnifiers in their original Picatinny mounts, on any M1913 Picatinny rail |
| Type |
Magnifier riser — adds 0.39in (9.9 mm) of height |
| Material |
Billet 7075-T6 aluminium |
| Finish |
Milspec Type III hard anodised — Black |
| Weight |
51 g (1.8 oz) |
| Mount interface |
M1913 Picatinny, rail on top |
| Made in |
USA |
| Brand |
Reptilia |
| MPN |
100-291 |
One part, one job: put the magnifier back on the dot's axis. Order the RMU Mount 0.39" today — in stock at Xtreme Tactical Gun Parts with £5 tracked UK delivery in 7–10 business days.
Explore more: AR-15 Parts & Accessories, Scope Mounts & Optic Risers or browse all Reptilia.
