The Holosun 507C X2 is a Chinese-made red-dot reflex sight designed by Holosun for use on standard-sized and compact pistols. Launched as the second generation of the 507C series, this model has established itself as one of the benchmarks on the market thanks to its exceptional price-performance ratio, its Multi-Reticle System (MRS) and its direct compatibility with the RMR mounting footprint, the most common on modern handguns.
History and Development of the Holosun 507C X2
Founded in 2013 in California, Holosun has quickly distinguished itself in the field of sighting optics by offering innovative technologies at affordable prices. The first generation of the HS507C was introduced to compete directly with the Trijicon RMR, which was then dominant in the pistol reflex sight market. Its RMR-compliant mounting footprint allowed it to immediately integrate into an already well-established accessory ecosystem.
The X2 version, launched in 2020, brought several significant improvements over the first generation. Holosun has integrated a Lock Mode to prevent accidental setting changes, redesigned the solar panel for better light capture, and optimized the internal electronics for reduced power consumption. The Multi-Reticle system has also been perfected, offering three user-selectable reticle options. These improvements solidified the 507C X2’s position as the most popular alternative to the Trijicon RMR, at a price 40-50% lower.
Technical Specifications
| Feature | Specification |
|---|---|
| Official designation | HS507C X2 |
| Country of Origin | China (Headquarters: United States) |
| Manufacturer | Holosun Technologies |
| Production years | 2020 – present |
| Lens type | Open reflex viewfinder |
| 1x magnification | (without magnification) |
| MRS Reticle | : 2 MOA dot / 32 MOA circle / circle + dot |
| 650 nm LED light source (red) with solar panel | |
| Light levels | 10 diurnal + 2 night vision compatible |
| Dimensions | 45.2 × 29.2 × 29.2 mm |
| Weight | 42.5 g (1.5 oz) |
| Viewing window | 16 × 23.1 mm |
| CR1632 Battery (Side Loading) | |
| Battery life | Up to 50,000 hours (lowest setting) |
| Water resistance | IP67 (immersion 1 m for 30 min) |
| Case Material | : Anodized 7075 T6 Aluminum |
| Windage/Height Adjustments | 1 MOA per click, ±50 MOA stroke |
| mounting footprint | (Trijicon RMR compatible) |
Operation and Technical Particularities
The Holosun 507C X2 stands out for several proprietary technologies that give it an edge over the competition. The Solar Failsafe system incorporates a solar panel on top of the viewfinder, capable of supplying the reticle with sufficient ambient light. In the event of battery drain, the solar panel automatically takes over, ensuring continuous operation of the viewfinder. This technology is particularly popular with daily wearers (EDCs) and competition shooters.
Shake Awake technology automatically puts the viewfinder to sleep after a period of inactivity and instantly reactivates it at the slightest movement. This system significantly extends battery life while ensuring that the sight is always ready for use when the weapon is grasped.
The Multi-Reticle System (MRS) offers three selectable reticle configurations: a 2 MOA point for distance accuracy, a 32 MOA circle for fast target acquisition at close range, or a combination of the two for versatile use. The reticle can be changed at the touch of a side button.
Another major advantage over the Trijicon RMR is the side battery drawer, which requires the complete disassembly of the viewfinder and a potential loss of zero to replace the battery. On the 507C X2, the CR1632 battery can be changed in a few seconds without disassembling the optics or altering the setting.
Variants and Versions
The Holosun 507 range is available in several variants to suit different needs. The HS507C X2 in red is the standard model, while the HE507C-GR X2 offers a green reticle, providing better contrast in certain light conditions. The ACSS Vulcan version, developed in partnership with Primary Arms, replaces the 32 MOA circle with an ACSS chevron designed to facilitate rapid target acquisition.
The Holosun 507K X2 is a miniaturized version for subcompact pistols, with a smaller specific mounting footprint. The Holosun 509T, on the other hand, adopts a titanium closed case that provides increased lens protection. The Holosun 508T shares the RMR footprint of the 507C but with a closed steel case.
Users and Applications
The Holosun 507C X2 is used by a wide range of shooters, from IPSC/USPSA competitors to everyday wearers to some law enforcement. Its robustness (IP67 certification, 7075 T6 aluminum housing) and reliability have been proven by numerous endurance tests exceeding 2,000 shots fired without failure. Several U.S. police departments have approved the 507C X2 for service, recognizing its durability and superior value for money. In competition, the circle-dot reticle is particularly popular for quick transitions between targets.
Civil Possession in Switzerland
In Switzerland, the Holosun 507C X2 is an optical accessory freely available for purchase without a special license. As a sight, not a firearm, it does not fall under the Federal Weapons Act (Firearms Act). It can be purchased from specialist gunsmiths or Swiss online dealers and can be mounted on any handgun equipped with an RMR standard mounting plate. Its installation on a legally owned pistol does not require any additional authorization.
Conclusion
The Holosun 507C X2 has redefined the expectations of the pistol reflex sight market by combining advanced technologies like Solar Failsafe, Shake Awake and Multi-Reticle System in a compact, rugged body at an affordable price. Its compatibility with the RMR footprint and its side battery drawer make it a practical and versatile choice, both for sport shooting and for everyday wear. It has established itself as the go-to benchmark in its price range and continues to influence the entire micro-optics market.
