Holosun HS507K X2 FDE Multi-Reticle 2 MOA Dot & 32 MOA Circle

In this review the Holosun HS507K X2 FDE is assessed as a compact open reflex sight intended for subcompact handguns, especially users of P365-style slides who need a rugged, quick-acquisition optic. The bottom line: this sight delivers a clear, fast sight picture via its Multi-Reticle System and long battery life, making it a practical upgrade for concealed carry and range pistols where size and durability matter. It is best chosen by shooters who value a small footprint, simple controls, and a reliable LED that can remain ready through Shake Awake.

Key Features

• Multi-Reticle System: The combined 32 MOA circle and 2 MOA dot gives a fast aiming reference at short distances while still allowing precise placements with the 2 MOA dot.
• Red Super LED: High-efficiency illumination provides a usable reticle across a wide range of brightness settings and supports up to 50,000 hours of battery life.
• Shake Awake: The sight conserves battery by deactivating the LED when idle and instantly reactivates with movement, keeping it ready without manual power cycling.
• Durable Construction: Machined from 7075 T6 aluminum with an anodized finish for a lightweight but robust housing suited to everyday carry use.
• Lock Mode and Side Battery: Button Lock Mode prevents accidental setting changes, and the side-mounted CR1632 tray makes battery replacement straightforward without removing the sight.
• Optic Footprint: Uses Holosun K footprint and is a direct fit for P365 Optic Ready slides, with an adapter plate required for four-boss interfaces.

Who It's For

The HS507K X2 is aimed at concealed carry owners and range shooters who need a compact, reliable reflex sight for subcompact pistols and value a fast target acquisition aided by a 32 MOA circle and precise 2 MOA dot. It is particularly suitable for those who appreciate long battery life and the convenience of Shake Awake.

Shooters who need magnification, very large viewing windows, or an integrated mounting solution for non-K footprint slides should look elsewhere, since this model is 1x with a small 0.58 by 0.77 in window and may require an adapter plate for some slide interfaces.

Pros & Cons

Pros

• Compact and lightweight for subcompact pistols while providing a quick circle-and-dot sight picture.
• Exceptional battery life with Holosun Red Super LED and Shake Awake to extend usable runtime.
• Robust 7075 aluminum housing and Lock Mode help keep settings secure under daily carry conditions.
• Side-mounted CR1632 battery tray simplifies replacement without major disassembly.

Cons

• Window is small compared with full-size red dots, which some users described as noticeably compact.
• Requires an adapter plate for slides with a four-boss interface rather than being universally direct-fit.

Specifications

Reticle	Red 2 MOA dot & 32 MOA circle
Magnification	1x
Battery	CR1632, side-mounted tray
Battery Life	Up to 50,000 hours
Housing	7075 T6 Aluminum, anodize finish
Window Size	0.58 x 0.77 in
Adjustment per Click	1 MOA

Our Verdict

The HS507K X2 FDE is a compact, well-built reflex sight that offers excellent value for shooters needing a small optic for subcompact handguns, combining a versatile circle-and-dot reticle with long battery life and features like Lock Mode. It is not for those seeking a large viewing window or built-in adapters, but for carry pistols it is a sensible, durable upgrade.

Frequently Asked Questions

Will this mount directly to a P365 Optic Ready slide?
Yes, it is a direct fit for P365 Optic Ready Series slides; slides with a four-boss interface will need an adapter plate.

How long does the battery last in normal use?
Holosun specifies up to 50,000 hours using the Red Super LED, with Shake Awake helping to extend practical battery life.

Can the circle or dot be turned off independently?
Yes, the Multi-Reticle System allows you to use the 32 MOA circle with dot, dot only, or circle only.