Holosun HS503R 2 MOA & 65 MOA Cicle Red Dot Sight with Rotary Switch
The HS503R boasts Holosun’s innovative Multi-Reticle System (MRS), offering shooters the choice between a precise 2 MOA dot, a 65 MOA circle, or a combination of both. This flexibility allows for quick target acquisition and adaptability to different shooting conditions. The sight is equipped with 10 brightness settings for daylight and 2 settings for night vision compatibility, ensuring clear visibility in all lighting environments. Its multilayer reflective glass enhances the clarity and sharpness of the sight picture, providing an excellent visual experience.
A standout feature of the HS503R is its remarkable battery life, powered by a single CR2032 battery. The sight can operate up to 100,000 hours on setting 6, thanks to its efficient power management system. The battery is housed in a user-friendly rotary compartment, allowing for quick and tool-free replacement. Additionally, the sight utilizes a rotary switch for easy adjustment of reticle brightness, ensuring rapid and precise control.
This red dot sight is designed with a parallax-free optical system and unlimited eye relief, allowing for rapid target acquisition and accurate shooting without the need for perfect eye alignment. It is IP67 rated, providing waterproof and dustproof performance to withstand harsh environmental conditions. Compact and lightweight, the HS503R features a 20mm window size and weighs only 3.74 ounces, making it an ideal choice for a variety of firearms.
The HS503R also includes both a lower 1/3 co-witness mount (1.63”) and a low mount (.75”), providing shooters with versatile mounting options to suit their preferences and shooting styles.
Dimension (in): 2.73×1.53×1.61
Weight (oz): 3.74
Housing Material: 6061 T6 Aluminum
Surface Finish: MAO
Adjustment per Click: 0.5 MOA
W&E Travel Range: ±50 MOA
Storage Temperature: -40℃~70℃
Working Temperature: -30℃~60℃
Submersion: IP67
Vibration: 1000G
Made from durable 6061 aluminum.
Lightweight (3.74 ounces) and robust design for longevity.
Rubber lens covers for optic protection against damage and debris.
Reticle System:
Holosun’s Multi-Reticle System (MRS) offers versatile aiming options.
Includes a 2 MOA dot, a 65 MOA circle, and a combination of both.
Facilitates quick target acquisition and adapts to various shooting conditions.
Brightness Settings and Optics:
10 daylight brightness settings.
2 settings for night vision compatibility.
Multilayer reflective glass enhances clarity and sharpness of the sight picture.
Battery Life and Management:
Powered by a single CR2032 battery.
Long battery life up to 100,000 hours on setting 6.
Rotary battery compartment allows for easy and tool-free replacement.
User-Friendly Features:
Rotary switch for simple adjustment of reticle brightness.
Parallax-free optical system with unlimited eye relief for rapid target acquisition.
Designed for accurate shooting without perfect eye alignment.
Environmental Durability:
IP67 rated for waterproof and dustproof performance.
Withstands harsh environmental conditions.
Compact and Mounting Options:
Compact design with a 20mm window size.
Includes a lower 1/3 co-witness mount (1.63”) and a low mount (.75”).
Versatile mounting options cater to different shooting preferences and styles.
- Lower 1/3 Cowitness Mount
- Low Profile Mount
- T10 L Key
- Rubber Cover
- User Manual
- CR2032 Battery
- Lens Cloth
- Holosun 10 years / product lifetime warranty. Read more here
Tactical Scope Shipping Policy
Our aim is to ensure that your order arrives with you as soon as possible and in the safest, most cost-effective means.
Shipping charges may be subject to additional surcharges if out of area or over weight restrictions.
DPD SHIPMENTS REQUIRE THE CUSTOMER TO SHOW A PIN CODE ON DELIVERY – READ MORE: HERE
Note: The above DPD link is to our group partner site Optics Warehouse, with whom we share logistics and stock. Link opens in a new window.
Couriers




We use DPD, Royal Mail, TNT, and UPS courier services for all our UK and international orders. Once your order is dispatched, you will receive an email with your unique tracking number.
In-Store Items
These are items we have in stock and aim to dispatch within 1–2 working days. During busy periods, this may be delayed slightly. If you'd prefer to collect your item in person, please contact us in advance to arrange. Collection orders must be paid for beforehand.
Pre-Order Items
Pre-order items are typically out-of-stock or in limited supply. Purchasing a pre-order secures your item, and it will be dispatched within 24 hours of restock where possible. Check the product page for estimated restock dates. These dates may change, so staying in touch is advised.
International Delivery & Taxes
If your shipping address is outside the UK, you may incur import duties or taxes upon arrival in your country. These charges are your responsibility. Customs regulations vary, so please check with your local customs office. Some packages may be opened for inspection.
Need Help?
If you need assistance, call us at +44 (0)1803 611895 (Optics Warehouse) or email order@tacticalscope.co.uk.
DPD Shipments & PIN Code Delivery
We have now introduced DPD Pin Code verification for all orders shipped via DPD. You will receive a PIN via email and text.
A valid email and mobile number must be provided at checkout. Emails will come from Riviera House 3PL. Please check spam/junk folders if not received.
Failure to present your PIN to the delivery driver will result in a failed delivery and rescheduling may be required.