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The Primary Arms Holosun HE507C-GR-X2-ACSS is a popular green-dot pistol optic. It's the Holosun 507C X2 platform (green LED version) with Primary Arms' exclusive patented ACSS Vulcan reticle. Primary Arms sells it directly, often with strong customer service and occasional deals.
Key Features and Specs
- Reticle: ACSS Vulcan — a 10 MOA center chevron (precise aiming point at the tip) surrounded by a very large ~250 MOA outer reference circle. The circle acts as an "aim assist" or "heads-up" guide: if the dot/chevron is off-center in your view, the big circle helps you quickly recenter it without hunting for a small dot. You can deactivate the outer circle if preferred. This setup is especially praised for new or intermediate red-dot-on-pistol users, as it speeds up target acquisition and reduces the common "where's my dot?" frustration.
- Reticle Color: Green (brighter and often easier to pick up in daylight than red for many users; some with astigmatism find green cleaner).
- Brightness: 12 settings (10 daylight + 2 NV compatible), with Solar Failsafe (top solar cell auto-adjusts or supplements power) and Shake Awake (motion-activated with last brightness recall).
- Battery: CR1632 (side-loading tray — no need to remove the optic to swap). Battery life is excellent: up to ~20,000–50,000 hours depending on setting and reticle mode (longer on dot-only).
- Build: 7075-T6 aluminum housing, black anodized, multicoated glass, IP67 waterproof. Lightweight at ~1.5 oz. Dimensions roughly 1.78" x 1.15" x 1.15". Window size: 0.63" x 0.91".
- Mounting: RMR/Holosun 407C/507C footprint (common for pistols). 1 MOA click adjustments. Parallax-free with unlimited eye relief.
- Other: Multi-reticle system on the base 507C X2, but the ACSS version is tuned around the Vulcan chevron + circle. Three modes: Auto (solar + battery), Manual, Lockout.
It's designed primarily for pistols (full-size or compact) but some run it on rifles with magnifiers or risers.
Who It's For
Many reviewers call it one of the best options for shooters transitioning to red dots on handguns. The large outer circle makes it forgiving and fast for defensive or dynamic shooting, while the chevron tip offers a precise point. It's less ideal if you prefer a plain 2 MOA dot (standard 507C X2 offers that) or want a smaller reticle. Some users love the chevron; others find it busy or prefer traditional dots. Green is generally well-regarded for visibility.
