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Holosun HS507K X2

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Holosun HS507K X2 Details

About the Reflex series

Reflex is one of the red dot sight series made by Holosun. These compact sights are not closed on both sides like the Tube, Infiniti and Paralow series, which is why they are very compact and lightweight (there are some exceptions to this in the Holosun Reflex series – HS512T is closed from both sides and thus bigger while HS510C is a reflex-type red dot sight of a bigger design).

The 407K and 507K models are designed specifically for pistol use – these red dot sights are even more compact than 407C, 507C, and 508T models. 407K and 507K are the first Holosun red dot sights that are equipped with a central dot size of 6 MOA.

The illumination is powered by a CR1632 battery. The click value for the elevation and windage adjustments is 0.5 MOA. These durable red dot sights feature a single-piece housing made out of 7075-T aluminum. Altogether, there are 12 illumination intensity levels to choose from, 2 of which are NVD compatible. The battery life is 50.000 hours.

About the model family

The 507 is one of the model families in the Reflex series. The first number '5' in its name means that the user can switch between a 2 MOA dot; 2 MOA dot surrounded by a 32 MOA circle or a 32 MOA ring only.

About the product (HS 507 K X2)

Holosun 507 K X2 is a red dot sight from the Reflex series.

The letter 'K' indicates the red dot sight's unique, miniature shape which makes it ideal for pistol use. It has a modification of the Shield RMS footprint instead of the Trijicon RMR footprint found on 407C, 507C, and 508T.

There are two large buttons for illumination control on the side of the device.

The product features the ShakeAwake function. When left powered on, the device will go from 'active mode' to 'sleep mode' after a while to prevent unnecessary battery drain. Once moved, it will power back on immediately.

Holosun 507 K X2 is the second generation from the 507K series of red dot sights. Not many differences can be found between the first and second generation.

Holosun added the button lock mode and made the illumination control buttons smaller. The buttons on the ‘X2’ model are also placed horizontally, whereas they were placed vertically on the first model.

Main features:

  • red illumination

  • made of 7075-T aluminium

  • 2 MOA dot & 2 MOA dot surrounded by a 32 MOA circle & circle only

  • incredibly compact and lightweight

  • perfect for a pistol

  • ShakeAwake function with the last setting recall

  • 12 illumination intensity levels – 2 of them are NV compatible

  • Parallax free

  • 50.000 hours of battery life

  • the battery compartment is at the side of the device

  • uses a modification of the footprint/mounting standard found on Shield RMS and SMS sights

  • the rear part of 507K acts as a rear sight when mounted on a pistol

Mounting details

Holosun 507K has a modification of the Shield RMS footprint for mounting purposes.


The Holosun Classic warranty is 5 years on the material and 3 years on the electronics.

For more information regarding the Holosun model labels, check our blog post.

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Holosun HS507K X2 Specifications

Dot sight seriesHolosun Reflex
Made inChina
In production since2020
WarrantyHolosun Classic - 5 years (Housing) / 3 years (Electronics)
Click Value 14mm/100m - 1/2MOA
Windage - mrad. 50mrad
Windage - MOA.172MOA
Reticle position 2. focal plane - SFP
Reticle illumination Yes
Illumination color Red
Usable at daytime Yes
Automatic Turn Off Yes
Size of Dot.2MOA
Adju. intensityYes, manual
Parallax setting Free of Parallax
Working temperature range-
Power Supply Unit-
Battery lifespan.50000h
Filled with -
Lens coatings Fully Multicoated
FootprintHolosun 407K/ 507K
Mount type - IntegratedNone
Mount length.0mm
Size of window14 x 19 mm
Dot Sight TypeReflex sight
Water proof Yes
Fogproof Yes
Shock proofYes


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Reviews & Testimonials

Reviews for Holosun HS507K X2

3 reviews
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All Perfect, but the screws... By
Wonderful little thing as accurate as its big brother ( HS 507 C ) but tinyer !
Mounted on my Glock 35 MOS Gen4, it makes its job perfectly...

Just one (big) problem: i used Blue Loctite but the Holosun torx tool chewed the
provided screws. Don't lock it and don't overscrew the torx or you will have
to use a Dremel driller, like i did, to get your Red Dot back !!!

One mistake from optics-trade review:

You DON'T have to modify your Glock MOS mounting plate if you use a SHIELD Low-Profile for Glock MOS: it fits perfectly...

No modification at all

Knowing all this, will buy it again from optics-trade.eu for the ultra-fast shipping to France and the very low price.

(Posted on 21/03/2021)

Absolutely Superb Quality, Function and Sevice By
Bought this Holoson HS 507K for my Sig 365 XL and it is a marraige made in Heaven. Simple to install and side access to the battery is smart. Illumination and sighting adjustments are clear and clean. Picking up the sight picture is smooth and quick. Love, love, love this upgrade to an already amazing gun. Optics-trade provided fast and coirteous service. They were exceptionally responsive to my communications and always leaning forward to be most helpful. I will definately buy for them again.

(Posted on 25/09/2020)

Reasonably price considering the scarcity of this optic. And it shipped reasonably quickly. However I am very disappointed that it did not ship with a battery.

(Posted on 11/09/2020)

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