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Holosun 503 Red Dot Sight – Compact, Rugged, and Feature-Packed

The Holosun 503 series delivers big performance in a compact red dot sight — ideal for AR-15s, tactical shotguns, PCCs, and any platform where fast target acquisition and durability are a must.

From home defense to competition, the 503 gives shooters a trusted optic with advanced features like solar power, Shake Awake™, and the Multi-Reticle System (MRS) — all in a lightweight, low-profile housing.

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🔍 Why Choose the Holosun 503?

If you're looking for an ultra-reliable optic that won’t weigh down your rifle, the Holosun 503 checks all the boxes. It blends intuitive operation with advanced tech at a price that makes it accessible for new and seasoned shooters alike.

Standout Features:

• Multi-Reticle System: Switch between a crisp 2 MOA dot, a 65 MOA ring, or both
• Solar Failsafe: Automatically powers and adjusts brightness in daylight
• Shake Awake™: Conserves battery and activates instantly when you move
• 50,000-Hour Battery Life: Run for years on a single CR2032
• Parallax-Free & Unlimited Eye Relief: Fast, accurate aiming with both eyes open
• Durable Build: Lightweight 6061 aluminum housing built to withstand recoil and impact
• Low & Absolute Co-Witness Mounts Included: Versatile out of the box

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📦 Popular Holosun 503 Models We Carry

Mounts Plus stocks the full Holosun 503 lineup, including:

• Holosun HS503CU – Red dot with solar and Shake Awake
• Holosun HE503GU-GR Elite – Green reticle with upgraded coatings and clarity
• Holosun HS503R – Rotary switch model with multiple brightness settings
• Holosun HE503C-GR Elite – Green MRS with solar failsafe and titanium finish

All models come with two mounts and are ready for AR-15s, shotguns, or PCCs.

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🔧 What’s in the Box?

• Holosun 503 red dot sight

• High (co-witness) and low mounts

• CR2032 battery (pre-installed)

• Lens cloth

• Tool and manual

• Holosun logo flip-up lens caps

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🛠️ Ideal Firearm Platforms

Thanks to its small footprint and rugged build, the Holosun 503 works perfectly on:

• AR-15 / M4 carbines
• Pistol-caliber carbines (PCCs)
• Tactical and defensive shotguns
• AK platforms with Picatinny adapters
• Lightweight hunting rifles

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📊 Holosun 503 vs 510C vs 507C

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💬 FAQ

Q: Will the Holosun 503 fit on my AR-15?
A: Yes. It includes both low and absolute co-witness mounts for Picatinny rails and installs easily on any flat-top AR.

Q: What is the difference between the HS503CU and HE503GU-GR?
A: The “CU” is a red dot model with solar and Shake Awake. The “GU-GR” uses a green reticle and comes from Holosun’s Elite series with better lens coatings and durability.

Q: Does the Holosun 503 have night vision compatibility?
A: Yes. Several models include NV-compatible brightness settings for professional use.

Q: What is the Holosun 503 battery life?
A: You’ll get up to 50,000 hours on a single CR2032 battery — plus the solar failsafe provides backup power in bright daylight.

Q: Is it durable enough for a shotgun or heavy recoil rifle?
A: Absolutely. The Holosun 503 is built with durable aluminum housing and tested to withstand recoil from shotguns and high-powered rifles.

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🔚 Ready to Upgrade Your Optic?

The Holosun 503 offers the precision, speed, and durability serious shooters demand — all in a compact footprint that’s easy to mount on nearly any firearm. Backed by Holosun’s reputation for innovation and our fast shipping, this optic is ready when you are.

👉 Order now from Mounts Plus and take your red dot game to the next level.