Holosun HS503R

The Holosun HS503R is a 20 mm micro red-dot reflex sight built for rifle and carbine use. This compact, 1× magnification optic offers a customizable aiming experience with the Multiple Reticle System (MRS), allowing you to switch between a precise 2 MOA dot, a fast-acquisition 65 MOA circle, or a combined 2 MOA dot with 65 MOA circle reticle — no re-zeroing required when changing modes.:contentReference[oaicite:1]{index=1}

The HS503R delivers up to 100,000 hours of battery life on a single CR2032, controlled via a rotary battery compartment for easy access.:contentReference[oaicite:2]{index=2} With 12 brightness settings (10 daylight + 2 night-vision compatible), unlimited eye relief, a parallax-free design, and IP67-rated water and dust resistance, it’s built to perform reliably in harsh environments.:contentReference[oaicite:3]{index=3}

Features:

• MRS reticle options: 2 MOA dot, 65 MOA circle, or combined Circle-Dot
• 20 mm objective lens diameter — compact micro-optic size
• Unlimited eye relief and parallax-free viewing
• Up to 100,000 hr battery life on CR2032 (medium setting)
• Rotary battery compartment for easy battery changes
• 12 brightness levels (10 daylight / 2 NV-compatible)
• IP67 water and dust resistant, rugged 6061-T6 aluminum housing:contentReference[oaicite:4]{index=4}
• Includes lower 1/3-co-witness mount and low-profile mount

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