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Questions & Answers
Does This fit on a UNITY FAST Micro mount ? Expert Answer

Yes, the Holosun HE503CU 2 MOA Dot & 65 MOA Circle Red Dot Sight uses the Aimpoint T1/T2 optic footprint and would be compatible with the FAST Micro Mount.

by Ethan, Gear Expert, September 21, 2022
Do I need a specific mount for this red dot? Or can I just mount it on a standard Pic rail? Expert Answer

The Holosun HE503CU comes with a low mount and lower 1/3 mount. Both of these mounts are made to fit on any standard picatinny/1913 rail, so you shouldn't have any issues mounting this red dot.

by Ethan, Gear Expert, January 6, 2022
Customer Reviews
Helpful Positive Review very clear circle dot sight by CC, Verified Owner, August 8, 2024
I have a pretty strong astigmatism so I’ve been looking for an optic with extreme clarity and this optic definitely fits the description. Extremely happy with it multiple settings easy to exchange batteries without remounting. I highly recommend it.
1/1 found this helpful
Helpful Positive Review Holosun 503 cu bu by Bridge, February 7, 2017
The brightness and quality stand out the most. This is a great optic for the price. Like life there are goods and bad but more good then bad. 65moa dot is crisp no glare from front or rear of the optic. Fits both left and right handed guns Ar and sho...
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15/16 found this helpful
Helpful Positive Review Holosun HE503CU 2 MOA Dot & 65 MOA Circle Red Dot Sight by Graphic, Verified Owner, March 9, 2021
Only thing I have a problem with is the battery tray and super small screws - you almost have to be a jeweler to get screws in, could never change a battery fast in a emergency situation. Prefer the side battery style - did not realize this on the ve...
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2/3 found this helpful
Helpful Positive Review Great optic don't hesitate! by Chomp, April 4, 2021
Was a little worried with some of the reviews, however mine has ran flawlessly. Shake awake feature and solar panel are game changers! Built well, crisp dot and has held zero perfectly! I will be buying more down the line for future rifle builds. May...
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1/2 found this helpful
Helpful Positive Review Best red dot period by MAGA 2017, December 30, 2016
Best red dot available period, regardless of price. Destroys AIMPOINT. Aimpoint better get back to the drawing board fast. Circle dot is crisp. Holds zero. Motion detector auto off/on plus solar. Yes the 503cu DOES have auto shut off after 10 minu...
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5/5 found this helpful
Helpful Positive Review COULDN'T FIND THE RED DOT!! BUT, CONTACTED HOLSUN, WHO SENT RETURN POSTAGE.... by BARRY, September 22, 2021
RETURNED TO ME, POSTAGE PAID, RED DOT / CIRCLE IN DOT HAD BEEN RE-ZERO'D AT THEIR FACILITY. MOUNTED ON AR PISTOL, SHOOTS LIGHTS OUT!! AMAZING WHAT A LITTLE PATIENCE, AND AN AMAZING CUSTOMER SERVICE AND TECH TEAM CAN DO FOR CUSTOMER SATISFACTION! T...
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3/3 found this helpful
Read All 51 Reviews
Color: Black Reticle: 2 MOA Illumination Color: Red Additional Features: Reduced training time and ammunition, Durable and reliable construction Included Accessories: Standard Condition: New Quantity: 1 Red Dot Sights-Footprint: Not Applicable

Code: 28Y-RD-RCJO-HS503CU

MPN: HS503CU

UPC: 605930624540

List: $307.05Save 37%
$194.49

Product Info for Holosun HE503CU 1x20mm 2 MOA Dot & 65 MOA Circle Red Dot Sight

The Holosun HS503CU 2 MOA Red Dot Sight is a small, compact sight filled with great features and options for every shooter. Featuring a 2 MOA red dot and a 65 MOA circle reticle, these Red Dot Sights by Holosun has a unique U-shaped housing design that covers the windage and elevation turrets on two sides. The Holosun HS503CU 65 MOA Circle Dot Scope also has the option to run on Solar Power and has automatic brightness settings that preserve the battery life, boasting up to 5 years of life on one CR2032 battery! The Holosun HS503CU Parallax Free Red Dot/Circle Sight works when you need it, and is perfect for your favorite shotgun, pistol, rifle, air rifle, or crossbow!image

WARNING: California`s Proposition 65

Specifications for Holosun HE503CU 1x20mm 2 MOA Dot & 65 MOA Circle Red Dot Sight:

Manufacturer: Holosun
Color: Black
Finish: MAO Finish
Magnification: 1 x
Objective Lens Diameter: 20 mm
Reticle: 2 MOA
Illumination Type: LED
Illumination Color: Red
Eye Relief: Unlimited
Adjustment Click Value: 0.5 MOA
Emitter Type: Enclosed
Battery Type: CR2032
Water Resistant Mark: 1 m
Weight: 3 oz
Additional Features: Reduced training time and ammunition, Durable and reliable construction
Included Accessories: Standard
Condition: New
Magnification Type: Fixed
Quantity: 1
Red Dot Sights-Footprint: Not Applicable
Co-Witness: Yes
Adjustment Range: 0.5 MOA
Attachment Type: Quick Detach
Housing/Frame Material: 6061-T6 aluminum

Features of Holosun HS503CU 65 MOA Circle Dot Scope, 28Y-RD-HS503CU:

  • 2 MOA dot & 65 MOA Circle
  • Reduced training time and ammunition
  • Unlimited field of view
  • Parallax-free with unlimited eye relief
  • Durable and reliable construction

Package Contents:

  • Holosun HS503CU Micro Red Dot Sight, 28Y-RD-HS503CU
  • Low mount and 1/3 Co-witness mount

Holosun HE503CU 1x20mm 2 MOA Dot & 65 MOA Circle Red Dot Sight Orderable Models

List of Orderable Models

Holosun Circle Micro Red Dot Sight 1x20mm, 2 MOA Dot, 65 MOA Circle, Black, HS503CU , MPN: HS503CU , UPC: 605930624540 , Code: 28Y-RD-RCJO-HS503CU

Holosun HE503CU 1x20mm 2 MOA Dot & 65 MOA Circle Red Dot Sight Unavailable & Discontinued Models

List of Unorderable Models

Holosun Circle Micro Red Dot, 2 MOA Dot, 65 MOA Circle, Black W/ Kinetic Development SIDELOK Aimpoint Micro Mount Lower 1/3 Co-Witness, Black , MPN: HS503CU-KIT1 , Code: 28Y-RD-RCJO-HS503CU-KIT1
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