Holosun HS507K X2 Red Dot Sight ACSS Vulcan Reticle
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The Holosun HS507K X2 ACSS (HS507K-X2-ACSS) is a 1x open reflex pistol red dot on the Holosun K footprint, carrying the Primary Arms ACSS Vulcan reticle — a red chevron inside a large guidance circle.
The ACSS Vulcan is the reason to pick this over a plain dot. The circle drags the eye to the centre of the window on the draw, and the tip of the chevron then gives a finer hold than any round dot of the same visual weight.
The housing is aluminium, 1.6 x 0.98 x 0.95 in and 1.0 oz, rated IP67 against water and dust and tested to 5000G of vibration. A CR1632 loads from the side for up to 50,000 hours, with Shake Awake and last-setting recall so the sight wakes at the brightness you left it on. There are 12 brightness settings, 10 for daylight and 2 for night vision, and the turrets move 1 MOA per click with 30 MOA of travel either way. It is parallax-free.
This is the compact member of the ACSS Vulcan family, sized for a slimline slide rather than a full-size one. Two things to keep in mind: the ACSS reticle is a Primary Arms exclusive configuration rather than a standard Holosun catalogue item, and the K-series has no solar panel — Solar Failsafe belongs to the larger C-series sights, so this one runs on the cell alone.
It fits slides cut for the RMSc pattern and RMSc-pattern adapter plates, which covers most slimline optics-ready pistols. For a switchable circle-dot on the same footprint see the HS507K X2 MRS, and on a full-size slide with a solar panel the HS507C X3 is the larger equivalent. More small-footprint optics sit in RMSc footprint red dot sights.
| Type | Open reflex pistol red dot sight, 1x |
|---|---|
| Reticle | ACSS Vulcan chevron and guidance circle |
| Reticle colour | Red |
| Footprint | Holosun K (RMSc pattern) |
| Illumination | 10 daylight / 2 night vision settings |
| Battery | CR1632 in a side-loading tray, up to 50,000 hours |
| Power management | Shake Awake with last-setting recall |
| Adjustment | 1 MOA per click, 30 MOA travel each way |
| Parallax | Parallax-free |
| Dimensions | 1.6 x 0.98 x 0.95 in (40.6 x 24.9 x 24.1 mm) |
| Weight | 1.0 oz (28 g) |
| Durability | IP67, 5000G |
| MPN | HS507K-X2-ACSS |
A chevron and a circle in an ounce of aluminium is a lot of aiming system for a slimline slide. Order the HS507K X2 ACSS today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: RMSc Footprint Red Dot Sights, HS507 ProMax or browse all Holosun
| Brand | Holosun |
|---|---|
| Part no. | HS507K-X2-ACSS |
| Category | Red Dot Sight |
| Barcode | 810047072393 |
£5 tracked UK delivery on every order via Royal Mail Tracked 24. Our products are ordered in from the manufacturer rather than held in UK stock, so please allow 7 to 10 business days (Monday to Friday, excluding bank holidays) from the date of your order for it to reach you. Tracking details are emailed on dispatch. UK delivery only.
You have 30 days from receiving your order to cancel it for any reason, then 14 days to send it back unused and in its original packaging. Faulty, damaged or incorrect items are replaced or refunded and we cover reasonable return postage. Refunds go back to your original payment method within 14 days of receiving the return.
7 to 10 business days from the date of your order. Every order is sent Royal Mail Tracked for a flat £5 and you receive tracking details by email when it is dispatched.
Yes. We list only genuine parts and optics from the brands shown, ordered in from the manufacturer for your order.
Compatibility notes on this page come from the manufacturer. If you are unsure, email us with your make and model before ordering and we will check rather than guess.
Yes. Bundle & Save applies automatically in your basket: 5% off when you buy 2 items, 10% off at 3 items and 15% off at 4 or more. It works across the whole range, so you can mix and match, and there is no code to enter.
Yes — you have 30 days from delivery to cancel for any reason, as long as the item is unused and in its original packaging. See our returns policy for the details.
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