Holosun HS510C Open Reflex Red Dot Sight

Holosun HS510C — Open Reflex Red Dot Sight for AR-15 & MSR

The Holosun HS510C is one of the most popular open reflex red dot sights on the market — combining Solar Failsafe, Shake Awake, and the Multi-Reticle System (MRS) in a rugged, full-size open reflex housing. The QD co-witness mount is included for fast, secure mounting on AR platforms. At $309.99, it delivers flagship-level features at a mid-range price point.

Whether you're running a home defense AR, competing in 3-gun, or hunting Colorado big game on an MSR platform, the HS510C's large open window and Solar Failsafe keep you on target fast — even if the battery dies.

Key Features

• Solar Failsafe — solar panel extends battery life; CR2032 battery backup always engaged
• Shake Awake — motion-activated instant-on, auto-sleep to preserve battery
• Multi-Reticle System (MRS) — switch between 2 MOA dot, 65 MOA circle, or both
• Large open reflex window — wide, unobstructed field of view for fast target acquisition
• QD co-witness mount included — fast, secure AR mounting out of the box
• IP67 waterproof rated
• 50,000+ hour battery life
• Titanium housing

HS510C vs. HS510C FDE — Which Is Right for You?

The standard HS510C comes in black at $309.99. The HS510C FDE versions are available in Flat Dark Earth with red or green dot options at $365.99–$379.99 — ideal if you're building a tan/earth-tone rifle. Same features, different finish and dot color.

Who Is the Holosun HS510C For?

The HS510C is the top choice for AR-15 and MSR shooters who want a feature-packed open reflex sight at a competitive price. It's ideal for home defense AR builds that need a reliable always-on optic, 3-gun competitors who want Solar Failsafe and a large window, and Colorado hunters running an AR-platform rifle. If you're asking "best Holosun red dot for AR-15?" or "best open reflex sight under $350?" — the HS510C is the answer.

In stock at Glenwood Springs Outdoors, 831 Grand Ave, Glenwood Springs, CO. Also available to order online.