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Holosun HS503 Models – Differences | Optics Trade Debates


Polona - 26. March, 2019 - 0 comments

Hello and welcome to another episode of Optics Trade Debates. We continue on our way through Holosun red dot sights. Today, we’re here to explain the differences between Holosun HS503 red dot devices from 4 different series (Paralow, Infiniti, Tube, Reflex) and the Elite versions of the same models.

For now, the Holosun HS503 variants consist of these models: 503BU, 503C, 503CU, 503GU and 503FL.

The first major difference lies in the location of the battery. All Holosun models that use the letter ‘B’ in the name, like HS503BU, feature a battery tray on the side of the device. The HS503CU red dot utilizes the same tray but with the addition of a solar panel. Models that feature the letter ‘G’ like the HS503GU have a side battery compartment, with a cap and so does the 503FL.

Upon closer inspection, there are also slight differences in the physical form of these devices. All models that include the letter ‘U’ in the name like 503BU, 503CU (+ Elite) and 503GU (+ Elite) have shrouded turrets, meaning that they have extra protection against bumps and rough handling. Solar panels are installed on top of red dots that feature the letter ‘C’ like the Holosun Paralow HS503C, for example. The 503FL model has flip-up covers.

Models HS503BU, HS503CU and HS503GU are also available in FDE colour variants.

All models with the number ‘500’ in the name utilize the multi-reticle system (MRS). That means that the user can switch between the standard 2 MOA dot reticle or the circle dot reticle (a 2 MOA dot with the 65 MOA circle around it).

As far as the mounts are concerned, these models are completely the same. They are all interchangeable with all mounting solutions for Aimpoint Micro models as they use the same profile and recoil stopper on the underside. Each model comes with a high mount for AR platforms and a low mount for hunting and other applications. The Holosun Paralow HS503FL model is the exception as only a low mount is possible with this red dot.

Note that all red dot sights, no matter the brand or the model in question, have a tilted objective lens. We explained this feature in a separate Optics Trade Debates episode and there is truly no reason for worry when noticing that your device’s front lens stands at an angle.

As of the end of 2018, there are 5 variants of the Holosun HS503 models, not including the Elite versions. Holosun uses the Elite name for the products that feature a green-illuminated dot and/or are made out of titanium. That means that the product can either have both of the two elite features or just one. But more on that next time.

This is everything we had in mind for this debate. Thank you for your attention. Please like and share this video if you found it useful. If you have any questions left, leave them in the comment section below or send us an email and we’ll be happy to answer. Subscribe to our Youtube channel for more content. We’ll see you next time.

Products mentioned:
Holosun Micro HS503BU: https://www.optics-trade.eu/en/dot-si…
Holosun Paralow HS503C: https://www.optics-trade.eu/en/holosu…
Holosun HS503CU: https://www.optics-trade.eu/en/dot-si…
Holosun Paralow HS503FL: https://www.optics-trade.eu/en/holosu…
Holosun Paralow HS503G: https://www.optics-trade.eu/en/holosu…
Holosun Micro HS503GU: https://www.optics-trade.eu/en/dot-si…


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