Reptilia DOT Optic Mount Lower 1/3 1.54" for Aimpoint ACRO & Steiner MPS
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Fits Aimpoint ACRO P1, P2 and C2 and Steiner MPS only, on any M1913 Picatinny rail. Fixed 39mm (1.54in) lower 1/3 bore height, not adjustable. Will not accept Aimpoint Micro, Trijicon MRO, RMR or Holosun 509T optics.
Not sure it fits your rifle? Ask us before you order
The Reptilia DOT Mount is a one-piece Picatinny optic mount for the Aimpoint ACRO and Steiner MPS, holding the optic at Reptilia's 39mm lower 1/3 height, listed by the trade as 1.54in bore height.
Cut for the ACRO footprint and set at one height. There is no dial, no spacer and no adapter plate — which is the entire point.
Machined from billet 7075-T6 aluminium in Type III hardcoat anodising, the DOT Mount clamps to any M1913 Picatinny rail with a spring-loaded nitrided 4140 steel clamp. Clamp and bolt sit flush with the body for a low-profile, anti-snag shape, and the assembly weighs 57 g (2.0 oz).
At the 39mm height, standard AR-15 back-up iron sights appear in the lower third of the ACRO's window, so the irons are available without covering the sight picture. The ACRO's enclosed emitter is the reason a lot of shooters choose it in British weather — nothing can bridge the emitter and the lens because the housing is sealed — and a mount with a single fixed interface keeps that reliability argument intact. Made in the USA.
Fits the Aimpoint ACRO P1, ACRO P2 and ACRO C2, and the Steiner MPS — any red dot using the ACRO footprint — on any M1913 Picatinny rail, including the flat-top upper of a UK straight-pull AR-15. Footprint and height are both fixed: ACRO footprint, Reptilia 39mm (1.54in) lower 1/3 height. If you want the tall head-up sightline instead, the 1.93in ACRO DOT Mount is the same footprint higher up, and the low-height ACRO DOT Mount goes the other way for subguns and gas-tube AK rails. An Aimpoint Micro will not fit this mount.
| Platform | AR-15 / M4 |
|---|---|
| Fits | Aimpoint ACRO P1, P2 and C2; Steiner MPS — 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 4140 steel clamp |
| Finish | Type III hardcoat 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 | 100-026 · 100-027 |
An enclosed-emitter dot at the co-witness height, on one machined part. Order the Lower 1/3 DOT Mount for Aimpoint ACRO 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 | Aimpoint ACRO P1, P2 and C2; Steiner MPS — 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 4140 steel clamp |
| Finish | Type III hardcoat 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 | 100-026 · 100-027 |
| Category | Optic Mount |
| Barcode | 850002688344 |
£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.
No. Same footprint, different height, and neither converts into the other. This one sets the optic at Reptilia's 39mm height — 1.54in bore height — for a lower 1/3 co-witness. The <a href="/products/reptilia-dot-mount-aimpoint-acro-1-93">1.93in version</a> raises the sightline for a head-up position. Buy on height, because the footprint is identical.
Yes. The MPS uses the ACRO footprint, so it mounts on the same interface with the same screws. Reptilia list both optics against this mount. Any other miniature red dot advertised as ACRO-footprint will also sit on it, but check the maker's own wording rather than assuming from the shape of the housing.
An enclosed emitter puts the LED inside a sealed housing rather than facing an open lens, so rain, mud and lint cannot sit between the emitter and the glass and dim the dot. In British conditions that is a practical difference rather than a marketing one. The mount does not change that either way — it just holds the optic at a fixed height with as few parts as possible.
Standard AR-15 back-up iron sights will appear in the lower third of the ACRO window at this height, which is what lower 1/3 co-witness means. Sights of non-standard height, or a rifle with a raised rail, will sit differently, so check yours against the optic before ordering rather than after.
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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