The Sightmark SM26043DE M-Spec M1 FMS is a compact reflex sight in Dark Earth designed for use on shotguns, pistols and AR-platform rifles. It features a 3 MOA red dot and a 21 mm x 15 mm objective window housed in a durable aluminum body with a steel protective shield. The unit is fully waterproof and includes ambidextrous digital controls, ten brightness levels, and a 12-hour auto shutoff to preserve battery life. The optic ships with low-profile mounts for shotguns and pistols plus a riser for AR platforms.
Key Specifications
- The magnification is 1x.
- The objective measures 21mm x 15mm.
- The reticle is a 3 MOA red dot.
- The dot size is 3 MOA.
- Power is supplied by a CR1632 battery.
- Battery life runs 300–30,000 hours on a single CR1632 with a 12-hour auto shutoff.
- Adjustment increments are 1.0 MOA.
- The finish is Flat Dark Earth.
- Weight is 2.30 oz.
- Eye relief is listed as Unlimited.
Rugged and compact, the SM26043DE M-Spec M1 FMS offers practical durability and long battery life for range sessions, competition, and professional use. Its combination of a protected housing, intuitive controls, and multiple mounting options makes it a versatile optic for a range of platforms where a reliable, low-profile red dot is required.
This description was generated with AI and may contain errors. Verify specifications and legal restrictions with the manufacturer before purchase. Provided “as-is” without warranties or guarantees.




