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The Primary Arms Holosun HS507C-X2-ACSS (also called the Holosun HS507C-X2 with ACSS Vulcan reticle) is a popular open-emitter pistol red dot sight. It combines Holosun's reliable X2-series platform with Primary Arms' patented ACSS Vulcan reticle, designed specifically to speed up target acquisition and help shooters correct muzzle cant or "dot fishing" issues common with traditional red dots.
Key Features
- ACSS Vulcan Reticle — A 10 MOA chevron (arrow-like) center aiming point paired with a large 250 MOA outer reference circle. The circle acts like an "aim assist": if your muzzle is canted or the dot is lost, the partial halo appears in your peripheral vision to guide corrections. You can deactivate the outer circle to save battery or reduce clutter. Many users (especially beginners or those transitioning to red dots) praise it for faster draws and better feedback.
- Multiple Reticle System (MRS) — Switch between the full chevron + circle or just the chevron.
- Solar Failsafe — Top-mounted solar panel provides automatic brightness adjustment in daylight and acts as a backup power source.
- Shake Awake — Motion-activated; the optic powers on instantly after inactivity (typically after ~10 minutes of stillness).
- Battery — Side-loading CR1632 (easy swaps without removing the optic from the gun). Battery life is rated 10,000–50,000+ hours depending on setting and solar contribution (often 20,000+ hours on medium brightness).
- Brightness — 12 settings total (including 2 NV-compatible low settings). Auto mode + manual with lockout.
- Construction — 7075-T6 aluminum housing, hardcoat anodized, fully multicoated glass. Lightweight at ~1.5 oz. RMR-compatible footprint (fits many pistols like Glock MOS, Sig P320, etc., with appropriate plates/adapters).
- Adjustments — 1 MOA clicks.
- Other — Night vision compatible, parallax-free, durable in field testing (including desert conditions).
It comes in red (standard) or green dot versions. The red is more common and generally sufficient for most users; green can appear brighter to some eyes.
Performance and Who It's For
Reviews consistently rate it highly (around 4.5/5 or better) for value and usability. The reticle excels for beginner to intermediate shooters, speeding up acquisition during draws, plate racks, or close-to-mid range work (e.g., 25 yards or less for precision with the chevron tip). It provides useful training feedback on grip/cant. Advanced precision shooters sometimes prefer a smaller 2 MOA dot for very fine work at longer distances, as the chevron can obscure small targets slightly.
It performs well in bright sunlight (no washout), holds zero reliably, and is low-profile enough for concealed carry or duty use. Many mount it on Glocks or similar compacts. Battery life is excellent in real-world use (often over a year with regular range time), and side battery access is convenient.
Common feedback from users:
- Great for astigmatism in some cases (chevron can be crisper than dots for certain people).
- Helps build muscle memory quickly.
- Durable and feature-packed for the price.
- Some note that auto-brightness isn't perfect in every lighting transition (manual mode works well).
