Holosun HS403B — No-Nonsense Red Dot for Serious Use

The Holosun HS403B is built for shooters who value proven function over flashy extras. This is a true “set it and forget it” micro red dot designed for harsh environments, constant duty, and responsive performance in every lighting condition. Its sharp 2 MOA LED dot delivers fast, repeatable target acquisition for both precision shooting and quick transitions—whether you’re running drills, stalking game at dawn, or zeroing in on steel under a blazing sun.

For anyone looking to buy a Holosun HS403B for rugged reliability or to order a red dot sight online that you can trust to perform year after year, this model stands out. What sets the HS403B apart isn’t just its marathon battery life (up to 50,000 hours on a single CR2032), but the no-nonsense reliability that comes from robust engineering. You’re getting a sealed, IP67 waterproof and dustproof housing milled from durable 6061-T6 aluminum, ready to shrug off rain, mud, hard knocks, and recoil.

The side-mounted battery tray means you can swap cells easily without having to remove your optic or re-zero, and the user-friendly controls let you toggle through 12 sharp brightness settings—2 for night vision, 10 for any daylight you’ll face. No frills, no fiddly auto-brightness or solar panels, just a tough, ultra-consistent electronic dot you can trust season after season.

Holosun’s standard low and lower 1/3 co-witness mounts mean out-of-the-box compatibility with AR, PCC, shotguns, and even bolt guns equipped with a suitable rail.

Specification Holosun HS403B

Best For:
Shooters who want bulletproof simplicity on carbines and shotguns, reliability for patrol or ranch rifles, or a trustable option for a home defense build—without the cost or complexity of solar, shake awake, or advanced electronics.

No-nonsense, confident, and always ready: the HS403B is a workhorse red dot for those who demand function over fluff.

Looking to buy or order the Holosun HS403B? At Professional Optics in Split, Croatia, we offer genuine products, technical advice, competitive pricing, and fast shipping across Europe. Make your next red dot purchase with confidence—order your HS403B online today at Professional Optics.