Sightmark M-Spec M1 FMS Red Dot — Dark Earth, 1×, 21×15 mm Window, 3-MOA Dot (SM26043DE • UPC 812495023378)
Give your rifle or PCC a fast, unobstructed sight picture with the Sightmark M-Spec M1 FMS in Dark Earth. This rugged, micro-sized reflex sight delivers a crisp 3-MOA red dot, a bright, daylight-visible reticle, and a durable fixed-mount system designed for repeatable zero on modern sporting rifles, pistol-caliber carbines, and tactical shotguns.
Built for Speed, Tuned for Precision
The M-Spec M1 FMS is purpose-built for rapid target acquisition without sacrificing accuracy. Its true 1× view and generous 21×15 mm window make it easy to keep both eyes open, maintain situational awareness, and place the dot precisely on target. From defensive drills to steel stages, this optic stays fast, stable, and consistent.
Key Features at a Glance
Magnification: 1× (both-eyes-open shooting)
Window Size: 21 mm × 15 mm for a clear, uncluttered view
Reticle: 3-MOA red dot—balanced for speed and refined aiming
Color/Finish: Dark Earth—low-glare, duty-ready aesthetic
Mounting: FMS (Fixed Mount System) for solid, repeatable rail engagement
Adjustment: Precision windage/elevation clicks for confident zeroing
Eye Relief: Unlimited—comfortable from any shooting position
Use Cases: Carbine competition, defensive training, range days, general tactical applications
Model / UPC: SM26043DE / 812495023378
Why 3-MOA?
A 3-MOA dot offers the best of both worlds—large enough to find immediately on the draw, yet fine enough to make accurate holds at distance. Whether you’re centering A-zones at 25 yards or ringing steel at 100, the dot stays crisp and intuitive.
FMS: Fixed Mount Confidence
The Fixed Mount System simplifies setup and maximizes consistency. Once torqued to spec on a quality Picatinny rail, you get a secure, repeatable interface that resists shift under recoil and rough handling. Fewer moving parts; more reliability.
Fast, Intuitive Controls
Thoughtful, glove-friendly controls make it easy to set dot intensity for bright sun, overcast range days, or indoor bays. Dial in your preferred brightness, verify zero with clean tactile clicks, and focus on the drill—not the optic.
Durable by Design
From the coated lens to the robust housing and low-glare Dark Earth finish, the M-Spec M1 FMS is engineered to resist hard use in real conditions—transport, barricades, brass kisses, and the occasional bump on the bench.
Ideal Platforms
AR-pattern carbines & pistols: Natural height over bore and rapid presentation
PCCs & subguns: Quick dot acquisition for fast splits and transitions
Tactical shotguns: Uncluttered 1× window for heads-up slug and buckshot work
Installation & Zeroing Tips
Prep the rail: Degrease the rail slots and the mount’s cross-bolt, then torque to manufacturer-recommended inch-pounds.
Set eye position: With a true 1× optic, place the sight to maintain a natural head position and full window view.
Rough mechanical zero: Start at 10–15 yards, confirm POA/POI, then refine at your preferred zero distance (e.g., 25, 36, or 50 yards).
Torque & mark: Tighten cap/rail screws evenly and add a small witness mark to monitor movement over time.
Specifications
Brand / Series: Sightmark M-Spec
Model: M1 FMS
Color: Dark Earth
Magnification: 1×
Objective Window: 21 mm × 15 mm
Reticle: 3-MOA red dot
Dot Color: Red
Mounting Interface: Fixed Mount System (Picatinny-compatible rail)
Part Number: SM26043DE
UPC: 812495023378
SEO Metadata (Merchant-Ready)
SEO Title: Sightmark M-Spec M1 FMS Red Dot — Dark Earth, 1×, 3-MOA, 21×15 mm Window (SM26043DE)
Meta Description (≤160 chars): Sightmark M-Spec M1 FMS red dot in Dark Earth. 1×, 3-MOA, 21×15 mm window, fixed mount. Model SM26043DE, UPC 812495023378.
Target Keywords: Sightmark M-Spec M1 FMS, SM26043DE, Dark Earth red dot, 3-MOA micro reflex, 1× red dot sight, 21×15 mm window red dot, Picatinny red dot
FAQ
Q: What dot size is the M-Spec M1 FMS?
A: It features a 3-MOA red dot—fast to acquire, precise for distance.
Q: Will it co-witness with my iron sights?
A: Co-witness height depends on rail height and irons. With the appropriate riser or mount geometry, absolute or lower-third co-witness is achievable.
Q: What platforms does it fit?
A: Any firearm with a quality Picatinny-compatible top rail—commonly AR carbines/pistols, PCCs, and tactical shotguns.
Q: Is the window big enough for fast transitions?
A: Yes—the 21×15 mm viewing window and 1× magnification support both-eyes-open shooting and quick dot pickup.
Q: How do I zero it quickly?
A: Start close (10–15 yards) to center the group, then confirm and fine-tune at your chosen zero distance (e.g., 25/36/50 yards).
The Sightmark M-Spec M1 FMS (SM26043DE) in Dark Earth combines a clean 1× sight picture, a precise 3-MOA dot, and a sturdy fixed mount—an ideal, value-rich red dot upgrade for carbines, PCCs, and tactical shotguns.
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