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The Holosun HS507K-X2 ACSS Vulcan Red Dot brings the award-winning ACSS Vulcan reticle to the K Series subcompact footprint — featuring a 3 MOA center dot with a 230 MOA outer reference ring that eliminates dot-hunting on micro pistol optics. Designed for concealed carry, with Shake Awake, side-loading CR1632 battery with up to 40,000 hours…

Holosun HS507K-X2 ACSS Vulcan – Red Dot Optic | 3 MOA Dot with 230 MOA Ring | K Series Footprint

The Holosun HS507K-X2 ACSS Vulcan Red Dot is a co-branded micro pistol optic from Holosun and Primary Arms, bringing the award-winning ACSS Vulcan reticle to the subcompact K Series footprint. Featuring a 3 MOA center dot surrounded by a 230 MOA outer reference ring, the HS507K-X2 ACSS Vulcan eliminates the common problem of hunting for the dot on micro pistol optics — a critical advantage on the smaller viewing windows of subcompact carry guns. Designed specifically for concealed carry and micro-compact pistols, the Holosun HS507K-X2 ACSS delivers innovative reticle technology in a lightweight, carry-optimised package.

Why the Holosun HS507K-X2 ACSS Vulcan Reticle Changes Micro Optic Shooting

ACSS Vulcan Reticle — 3 MOA Dot with 230 MOA Outer Reference Ring
The ACSS Vulcan reticle on the Holosun HS507K-X2 features a 3 MOA center dot for accurate shot placement, surrounded by a large 230 MOA outer reference ring that addresses one of the biggest challenges of micro pistol optics — finding the dot on a small window under stress. When the shooter is on-target, the outer ring is barely visible. When the aim is off-target, the edge of the ring appears in the window as an intuitive indicator directing the shooter back to center. This makes the HS507K-X2 ACSS Vulcan significantly faster to acquire than conventional micro red dots, especially in high-stress defensive situations and for shooters new to slide-mounted optics.

Multi-Reticle System — Dot, Circle, or Combined
Beyond the ACSS Vulcan, the Holosun HS507K-X2 ACSS retains Holosun’s full Multi-Reticle System, allowing the shooter to toggle between the 3 MOA center dot only, the 230 MOA outer ring only, or both together, without re-zeroing since all reticles are projected from the same LED.

Shake Awake Technology for Instant Readiness
The HS507K-X2 ACSS Vulcan features Shake Awake — a motion-activated system that powers the optic on instantly when movement is detected and powers down after inactivity — ensuring the optic is always live the moment you draw without draining the battery during storage.

Up to 40,000 Hours of Battery Life with Side-Loading CR1632
The Holosun HS507K-X2 ACSS delivers up to 40,000 hours of battery life at medium settings from a side-loading CR1632 battery, allowing replacement without removing the optic from the slide and preserving zero between changes.

12 Brightness Settings with Night Vision Compatible Modes and Lock Mode
The HS507K-X2 ACSS Vulcan features 12 brightness settings including night-vision-compatible modes, plus Lock Mode that locks the buttons to prevent inadvertent setting changes during concealed carry and holstering.

K Series Footprint for Subcompact Pistol Compatibility
The Holosun HS507K-X2 ACSS Vulcan uses the Holosun K Series footprint (Modified RMSc), mounting directly to K-cut slides including Sig Sauer P365 X/XL, and using an adapter plate for RMSc-cut slides including Glock 43X MOS and 48 MOS. Note: the K footprint dimensions are slightly different from the standard RMSc footprint — always verify compatibility with your specific pistol before purchasing.

7075-T6 Aluminium Housing with IP67 Waterproofing
The HS507K-X2 ACSS Vulcan is CNC-machined from 7075-T6 aluminium with a hard-anodized finish, rated IP67 waterproof, parallax-free, and with unlimited eye relief for fast acquisition from any shooting position.

Holosun HS507K-X2 ACSS Vulcan Full Specifications

• Model: Holosun HS507K-X2-ACSS
• Reticle: ACSS Vulcan — 3 MOA Center Dot + 230 MOA Outer Ring
• Reticle System: Multi-Reticle System (MRS) — dot, circle, or combined
• LED Wavelength: 650nm Red Super LED
• Sight Window: 0.77 x 0.58 inches (micro footprint)
• Illumination Settings: 12 total including night vision compatible
• Lock Mode: Yes
• Memory Mode: Yes (last-setting recall)
• Shake Awake: Yes
• Battery: Side-loading CR1632
• Battery Life: Up to 40,000 hours at medium setting
• Housing: 7075-T6 Aluminium, CNC-milled, Hard-Anodized
• Waterproof: IP67
• Parallax Free: Yes
• Eye Relief: Unlimited
• Footprint: K Series (Modified RMSc)
• Compatible Pistols: Sig P365 X/XL (direct), Glock 43X MOS, Glock 48 MOS (adapter plate), and other K/RMSc footprint subcompact pistols
• Ideal For: Concealed carry, EDC, subcompact pistols, new RDS shooters, shooters with astigmatism
• Brand: Holosun / Primary Arms (ACSS)