Holosun HS507K X2 Red Dot Sight

The Holosun HS507K X2 Red Dot Sight is an open reflex optical sight designed specifically for concealed carry pistol applications, and it packs a full feature set into a footprint small enough for a compact slide. Pistol optics are no longer a novelty, and this is one of the reasons why.

The X2 Series brought two meaningful improvements to an already popular optic. Both of them address the same problem, which is accidental setting changes on a gun you carry every day.

What the Holosun HS507K X2 Red dot delivers

This is an open emitter reflex sight sized for subcompact and compact pistols. The open design keeps the optic light and gives you an unobstructed window, which is exactly what you want when the sight sits on a carry gun rather than a competition race gun.

The first X2 improvement is the addition of Lock Mode, carried over from the 2018 and 2019 law enforcement pistol optic models. When activated, Lock Mode locks the buttons and prevents inadvertent setting changes while the pistol is holstered.

The second improvement complements the first. The buttons have been redesigned and repositioned lower and out of the way, so they are far less likely to be pressed by a holster, a belt, or a car seat in the first place.

Key features of the Holosun HS507K X2 Red dot sight

• Open reflex design purpose-built for concealed carry pistol applications.
• Lock Mode that prevents inadvertent setting changes when activated.
• Redesigned buttons placed lower and out of the way to complement Lock Mode.
• Super LED with up to 50,000 hours of battery life.
• Multi-Reticle System that lets you switch between reticle options to suit the task.
• Shake Awake technology that sleeps the emitter and wakes it the instant the pistol moves.

Specifications and what they mean on a carry gun

Up to 50,000 hours of battery life from the Super LED is the specification that makes red dots practical for daily carry. That is years of runtime, which means the optic can simply stay on rather than being switched on when you need it.

Shake Awake works alongside that runtime. The emitter drops into a low-power sleep when the pistol is still and wakes instantly on movement, so you get the battery savings without ever drawing to a dark window.

The Multi-Reticle System is more useful than it sounds. A small dot serves precision work, a circle dot speeds up close-range target acquisition, and having both available in one optic means you can tune the sight to the way you actually shoot.

Lock Mode is the feature carry users appreciate most over time. Setting your brightness and reticle once and then locking the buttons eliminates the possibility of discovering a changed setting at the worst possible moment.

Mounting, zeroing, and care

Confirm your slide cut matches the Holosun HS507K X2 Red dot footprint before ordering, or plan on an adapter plate. Use the correct screws, apply thread locker, and torque to specification, because pistol optics come loose when they are installed by feel.

Zero at 15 or 25 yards depending on your intended use, and confirm the zero after a hundred rounds to make sure the mount has settled. Then re-check the screws, since the first hundred rounds are when a loose install reveals itself.

Train the draw and presentation deliberately. Finding the dot is a learned skill, and dry practice against a wall for a few minutes a day builds it faster than range time alone. Suppressor-height iron sights are a worthwhile backup.

Keep both lenses clean with a microfiber cloth and check the window for carbon after range sessions, since an open emitter collects residue. Explore mounting plates and more sighting solutions in our optics collection.

Compact, durable, and thoughtfully refined, this Holosun optic is built for the way people carry now. Ships direct to your door, no FFL required.