Mepro USA MPO-S MOA Bullseye Reflex Sight with RMS-C Compatibility - Model 901141171

The Meprolight MPO-S MOA bullseye reflex sight with RMS-C compatibility is a compact, pistol-mounted red dot designed for shooters who prioritize speed and simplicity in defensive or concealed-carry applications. Built on the widely-adopted RMSc/JPoint footprint, the MPO-S drops directly onto most modern micro-red-dot-ready handguns without adapters or gunsmithing—a practical advantage if you're running optics on a duty gun, competition rig, or personal-defense pistol. At just 0.8 ounces and engineered with a low-profile envelope, it won't snag clothing during the draw and won't add noticeable bulk to your carry gun.

What sets the MPO-S apart is its three-segment reticle system: a crisp 3 MOA dot for precision aiming, a 33 MOA bullseye for rapid target acquisition, and a 33 MOA ring that gives you multiple aiming references depending on distance and shooting style. You dial in whichever reticle works for your shot, keeping your focus on the threat rather than fumbling with optics. The sight runs on a single CR1632 battery good for over 20,000 hours on mid-range settings—roughly 2.5 years of continuous use—so you can mount it and forget about it until your annual battery swap.

Meprolight built the MPO-S to handle the field: it's waterproof to IPX7 standards, fog-proof, and rated for operation from −4°F to +140°F. Automatic and manual brightness control let you dial in visibility in daylight or with night-vision gear (10 daylight, 2 NV settings), and a power-saving sleep mode stretches battery life if your sight sits unused for extended periods. Windage and elevation adjust in 1 MOA clicks across a ±30 MOA travel range—enough for most point-of-aim corrections at typical defensive distances.

If you're shopping for a reflex sight that prioritizes simplicity, durability, and practical speed without unnecessary bells, the MPO-S is worth a hard look.

Key Features

• RMSc/JPoint footprint for direct mounting to RMS-compatible handguns
• Three-segment user-selectable reticle (3 MOA dot, 33 MOA bullseye, 33 MOA ring)
• Ultra-lightweight at 0.8 oz with low-profile design to minimize snags during draw
• Single CR1632 battery delivers 20,000+ hours of runtime on setting 5
• 10 daylight brightness settings plus 2 NV-compatible settings
• Automatic and manual brightness control with power-saving sleep mode
• IPX7 waterproof and fog-proof construction
• 1 MOA windage/elevation adjustment with ±30 MOA total travel
• Operating range −4°F to +140°F

Specifications

Footprint	RMSc/JPoint
Objective Lens Dimensions	0.80" W × 0.60" H
Reticle Type	3-Segment (3 MOA dot, 33 MOA bullseye, 33 MOA ring)
Reticle Color	Red
Brightness Settings	10 daylight / 2 NV
Auto-Brightness	Yes
Manual-Brightness	Yes
Battery Type	1× CR1632
Battery Life	20,000+ hours (setting 5)
Adjustment Increment	1 MOA
Windage/Elevation Travel	±30 MOA / ±30 MOA
Operating Temperature	−4°F to +140°F
Waterproof Rating	IPX7
Fog-Proof	Yes
Weight	0.8 oz

Frequently Asked Questions

What handguns is the MPO-S compatible with?

The MPO-S uses the RMSc/JPoint footprint, so it mounts directly to any pistol cut for that standard—including many modern carry and duty guns. Check your firearm's manual or contact the manufacturer to confirm your specific model accepts RMS-compatible optics.

Can I use the MPO-S with night-vision equipment?

Yes. The sight offers two NV-compatible brightness settings in addition to its 10 daylight levels, allowing it to function alongside NV devices without blooming or washout.

How long does the battery last?

A single CR1632 battery provides over 20,000 hours of continuous runtime on setting 5, which translates to approximately 2.5 years of uninterrupted use. Battery life varies depending on brightness setting and usage pattern.

What's included in the box?

The product record does not specify what accessories or documentation ship with the MPO-S. Contact us for a complete list of included items.