Holosun HS403B Paralow Red Dot Sight - 2 MOA, Picatinny Mounts, Matte Black

The Holosun HS403B Paralow red dot sight is a compact micro red dot built for shooters who want a rugged, battery-efficient optic on pistols, shotguns, air rifles, or crossbows. This LED-based reflex sight delivers a crisp 2 MOA dot that works equally well in bright daylight and low-light conditions, and Holosun's proven Shake Awake technology wakes the sight with minimal movement—no need to manually power up between trips to the range or field. A single CR2032 battery powers the HS403B for up to five years, making it one of the most practical long-life red dots for folks who don't shoot daily.

The matte black finish resists glare and blends cleanly on modern platforms. Standard Picatinny mounting means the 403B drops onto most modern slide cuts, upper receivers, and universal rail systems without adapters. The optic is designed to handle extremes—heat, cold, rain, dust—without losing zero or brightness, so you can trust it whether you're working in the desert or timber.

Parallax-free performance means your point of aim stays true even if your eye position shifts slightly behind the glass. For shooters building a no-nonsense carry gun, home-defense carbine, or plinker that needs dependable 1x aiming without the fuss of batteries dying every season, the HS403B delivers straightforward, honest performance at a real-world price.

Key Features

• 2 MOA red dot for precise aiming at close to intermediate distances
• LED technology with up to 5-year battery life on a single CR2032
• Shake Awake motion-sensing activation—sight powers on with movement, powers down when still
• Parallax-free design ensures point of aim stability across eye positions
• Rated for extreme weather and temperature swings
• Compatible with pistols, shotguns, air rifles, and crossbows via standard Picatinny mount
• Durable matte black construction

Specifications

Frequently Asked Questions

What firearms can I mount the HS403B on?

The HS403B is compatible with any firearm or air gun that accepts standard Picatinny mounts, including pistols, shotguns, air rifles, and crossbows. It works on modern slide-cut pistols, upper receivers, and rail systems without additional adapters.

How long does the battery last?

A single CR2032 battery will power the HS403B for up to five years of typical use. The Shake Awake feature helps extend battery life by powering the sight down when motion stops, so you're not draining the battery while the gun sits in storage.

Is the HS403B good for hunting and tactical use?

Yes. The 2 MOA dot works well for hunting and defensive shooting at practical distances, and the sight is rated to perform in extreme weather and temperature swings without losing zero. The parallax-free design ensures your point of aim stays true even if your shooting position shifts slightly.

How does Shake Awake work?

Shake Awake is Holosun's motion-sensing technology that automatically powers the red dot on when the sight detects movement, and powers it down when the gun is still. This convenience feature also helps conserve battery life during storage.