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Holosun Paralow HS503 Review – Is this Red Dot Sight any Good?

A red dot sight such as the Holosun Paralow HS503 is a reliable tool that allows its users to aim accurately in a variety of conditions. Whether its day time or a low-light environment, you can always rest assured that a reliable red dot sight will help you aim at targets with better efficiency.

Review of the red dot sight Holosun Paralow HS503

With the Holosun Paralow HS503c circle dot sight, zeroing in on a target has never been easier. But, this is just one of the reasons why the HS503 red dot sight is one of the top-performing devices on the market. In this review, we are going to take a closer look at the Holosun Paralow HS503 red dot sight to find out what’s in store for shooters on the range and in the wild.

Quick Overview

Holosun is a brand name that is synonymous with quality. The company has been in the business of delivering exceptional products since its inception. The company is also well known for manufacturing efficient and accurate red dot sights that cater to the budget category of red dot sights in the market.

It is important to note that the Holosun Paralow HS503 Red Dot Sight boasts of the body of the much-loved Aimpoint micro sight, and features an outer circle reticle of the EOTech, which comes with an inner bullet drop reticle. This red dot sight also offers the option for the user to switch off the outer circle reticle if they need to, which adds to the versatility of this particular red dot sight.

This also marks a fresh new approach from the company in an industry that has not yet adopted this level of customization. Overall, the Holosun Paralow HS503 Red Dot Sight is a smart choice for all those who are looking for a reliable and accurate red dot sight on a budget.

Technical Aspects

Without further ado, here are the technical specifications that the Holosun Paralow HS503 Red Dot Sight has to offer:

Zoom Range

The Holosun Paralow HS503G Red Dot Sight brings some cutting-edge technology to the game thanks to Holosun and Primary Arms coming together to bring you the world’s first red dot sight that uses the ACSS CQB reticle (patent-pending). This is a big deal mainly because it helps solve a major problem with red dots that are available today.

HS503G-ACSS Reticle

Other models in the series offer different reticles that follow more traditional red dot sights on the market today.

For example, an issue with the dot sights that are available in the market is that while the large dot reticle is great to use up close, it is not as efficient when it comes to aiming at targets that are further than 100 yards. This is because the red dot gets too large to take an accurate aim. While using a small dot along with a decent magnifier does fix this problem, it makes close-quarters snap shooting more difficult.

The patent-pending ACSS CQB reticle helps solve this problem by using a big chevron that is picked up by the eye easily during close-quarters shooting.

For long-distance shooting, the chevron’s tip appears to be extremely small, which makes it the perfect choice for long-distance shooting as well. The Holosun Paralow HS503 red dot sight is great for holdovers from 100 yards to 600 yards, thanks to 7.62 and 5.56 NATO compatibility.

Available Reticles

The Holosun Paralow HS503G Red Dot Sight offers three BDC dots that are under the chevron. This allows for an amazing 600-yard bullet drop compensation when using a 5.56 or 7.62 NATO caliber rifle. With a click value of 1/2 MOA, with audible clicking, you can rest assured that you will be able to zero in on the target more accurately. Users can also easily switch between 2 MOA red dot and an ACSS reticle.

Other models in the Paralow HS503 series offer more traditional red dot reticles for shorter distances. The ACSS reticle by Primary Arms is specifically designed for medium to long-range shooting.

Field of View

The 2 MOA dot is centered within a 65 MOA circle for better vision capabilities. What improves the accuracy of the Holosun Paralow HS503 Red Dot Sight is that the diameter of the circle reticle has been designed to represent around 5.5 inches at a range of 100 yards, or 170m at 100m.

Turrets and Adjustments

The Holosun Paralow HS503 Red Dot Sight features wind leads and auto-ranging, which makes it easier to aim accurately while using this tiny reticle. Windage of the HS503 is set at 0 MRAD. To adjust elevation and windage in this red dot sight, the click value is given at 0.5 MOA, which results in pinpoint accuracy.

Size of Dot

The reticle of the Holosun Paralow HS503 Red Dot Sight is basically a central 2 MOA dot, which means that it has been centered in a 65 MOA circle and offers up to 4 positioning points with micro-dots.

The Primary Arms’ ACSS reticle that has been used in the HS503 red dot sight is popular because it offers an all-round functionality that’s simply unmatched, such as, easy wind leads settings, BDC dots, and accurate ranging, etc.

Check out the Best AR-15 Red Dot Sights!

Illumination Settings

The Holosun Paralow HS503 Red Dot Sight features a versatile brightness range, which makes it possible to take accurate aim even in low-light conditions with ease. This red dot sight features 12 illumination intensity levels, 2 of which are compatible with NVD, which makes taking aim at targets that are further away much easier. Also, switching from near to distant targets is a breeze with this red dot sight.


This red dot sight is also as versatile as they come with the removable 1913 Picatinny Mount (which can be easily removed to reveal the Aimpoint Micro-compatible base below). The sight can also be used on almost any firearm thanks to the mount type that’s both H1 and T1 compatible.

The Holosun Paralow HS503 red dot sight feature comes with a low-mount and high-mount for faster lower-third co-witness (lower 1/3 co-witness) while using a standard AR platform. With the HS503G, expect to get the same mounting options as the Aimpoint Micro, except for those sights with “A” in the serial number.

Waterproof Design

Another major selling point of the Holosun Paralow HS503 red dot sight is that the product is IP67 water-resistant. For those who are unaware, this basically means that the sight can be dropped in up to a meter deep of water for half an hour. This red dot sight is also dust resistant, which helps to significantly improve its versatility and use in harsh conditions.

Battery Life

With a battery life of up to 50.000 hours, this red dot sight is not going to run out of juice any time soon. The battery compartment is located on the right-hand side of the sight just under a round-shaped cover.

The HS503 also features Holosun’s LED technology along with “Shake Awake” technology that powers the optic even at the slightest movement. This helps conserve power when the sight is not in use, resulting in a significantly longer battery life.

Comes with a Limited Warranty

The Holosun Paralow HS503 Red Dot Sight has been built using premium quality materials. The aluminum 6061-T6 frame of the HS503G has been nicely complemented with a hard-coat anodized finish, which improves its durability.

That being said, the Holosun Paralow HS503 Red Dot Sight does come with a limited warranty. Users will be glad to know that the Holosun Classic comes with a 5-year warranty, while the electronics within come with a 3-year warranty.


Overall, the Holosun Paralow HS503 Red Dot Sight is a smart choice for those who are looking for a reliable and efficient red dot sight that’s reasonably priced.

With over nine months of battery life when used frequently, versatile mounting options, and not to forget, the patent-pending ACSS CQB reticle, this red dot sight offers you with plenty of features to go around. This makes taking aim easy, whether you’re hunting in the wild or shooting on the range.

The 5-year warranty that the brand offers is a nice addition, which just sweetens the deal for an otherwise decent red dot sight that’s not going to fail you when it comes to accuracy and achieving targets quickly.

Review of the red dot sight Holosun Paralow HS503
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Tom Devine