Holosun 407C and 507C are among the most popular open reflex red dot sights on the market. They are not the lightest red dots around, but the durability and robustness more than make up for it. A while ago, Holosun released the second generation of these models.
The first-generation models had small buttons for the illumination adjustment. These were somewhat inconvenient to use, especially when shooting – while looking at the target, the shooter could not locate and press the desired button as quickly as he or she wanted to. On top of that, they were placed horizontally, making it difficult to remember the exact position of the ‘–‘ and ‘+’ button. The second-generation models have much bigger buttons which are easier to locate. Furthermore, they are placed vertically – having the ‘+’ button above the ‘–‘ is much more intuitive and simpler to memorize.
The old models had the battery compartment on the bottom. The user had to remove the sight from the firearm to access it, not to mention that it had to be re-zeroed once it was put back on. The battery compartment had to be opened with a special tool, and the whole process was kind of clumsy. Holosun improved this by moving the battery compartment to the side. Now, you do not have to remove it from the firearm to change the battery. Re-zeroing is also avoided. Because the compartment has been moved upwards where there is less space, Holosun had to change the battery standard – it is now CR1632 instead of CR2032.
For now, there are four models available:
Models with ‘4‘ as the first digit feature a 2 MOA dot reticle. Models with ‘5’ as the first digit feature a switchable reticle – the user can toggle between 2 MOA dot, circle dot, and circle only.
RD means red illumination. GR stands for green illumination.
C stands for ‘solar cell’.
Holosun used the same form factor for the second generation. CNC-milled 7075 aluminium is used for housing. The devices weigh around 40 grams.
The solar panel on top is extremely useful as the illumination is powered by solar energy even if the battery dies. You can also use solar mode even while the battery is working to preserve battery life.
The drain holes prevent water from accumulating in the place between the diode and the lens. Open reflex sights are not meant to be used in rain, but if you are caught in bad weather for some reason, you will not have to flip the sight to get the water out.
A Trijicon RMR footprint (same as with the first generation) is used for mounting purposes. A fixed Picatinny mount is added in the box. It adds approx. 4 mms of height.
The elevation and windage adjustment screws can be rotated with an included tool. A click equals 1 MOA, which translates to approx. 1.5 centimeters at 50 meters.
If you leave the sight stationary, it goes into sleep mode thanks to the Shake Awake function. When you move it again, the illumination turns back on in an instant.
All the sights are waterproof with an IPX7 certification.
To sum up, the second generation has two improvements from the first one. Buttons are larger, placed in a vertical manner, and the battery compartment has been moved from the bottom to the side, resulting in the use of a smaller, CR1632 battery compartment.
The prices range from 290 to 410 €, depending on the model. A great choice if you are looking for a robust open reflex sight.