The HE507K X2 Green is an open reflex optical sight designed for concealed carry pistol applications. The X2 Series pistol optics feature two improvements. First is the addition of Lock Mode from our 2018-2019 LE pistol optic models. Lock Mode, when activated, locks the buttons preventing inadvertent setting changes. Second, the buttons have been redesigned to compliment the Lock Mode by placing them lower and out of the way. Additional features include Holosun's Super LED with up to 50k hours battery life, Multi-Reticle System, and Shake Awake.
Holosun 507K X2 Green Reticle
FreedomGorilla Staff Review
The 507K-GR is an awesome site designed for concealed carry. Multi reticle system is a really cool feature that lets you use them both together or toggle through just a 32 MOA circle only or a 2 MOA dot only. The concept behind the 32 MOA circle is so you can easily find it better when drawing the gun. It even has rear dovetails to act as rear irons sights.
The Holosun 507k is a micro compact reflex site made for sub compact pistols. It is the premium top of the line micro reflex sight holosun makes. It is a step above the 407k. It competes with the RMRcc, etc, etc.
It has an open emitter, aluminum housing, comes in red or green dot versions, and weights 1 oz.
The 507K-GR has many of Holosun’s features such as shake awake, multi reticle system, long battery life, glass, etc.
It has 2 nightvision modes and 10 daylight modes.
The only thing this site doesn’t have is solar charging, and auto brightness settings, which the 507c does.
The battery will last 50,000 hours on setting 6 with the dot only reticle. With the circle dot plus dot it will last 10k-25k hours depending on brightness settings. Should be around 20k hours on setting 6.
It accepts a CR1632 battery which is conveniently located in a side tray which means you don’t have to remove the sight and risk losing zero when changing the battery.
The MRS system is holosuns multi reticle system. It lets you choose from 3 dots, a 32 MOA + 2 MOA dot, 2 MOA dot only, or 32 MOA dot.
Some of the benefits of the 32 MOA dot + 2 MOA dot are that it’s easier to pick up upon drawing
The size of the 507k is just under 1 inch wide, 1 inch tall, and 1.6 inches in length, the actual size is 1.6x0.98x0.95. The window size is 0.58x0.77 inches.
The 507K-GR is made out of aircraft grade 7075 T6 aluminum and is very durable, waterproof IP67 is certified tested to be 100% protected against solid objects like dust and sand and has been tested to work for at least 30 minutes under 6 inches to 3.3ft of water, and can withstand drop tests.
The 507K-GR comes with a manual, cleaning cloth, two set of screws with blue Loctite already applied, and an adjustment tool for the turrets so you can change the elevation and windage as needed. Each adjustment click has a value of approximately 1 MOA or 1 inch at 100 yards (1/2" at 50y; 1/4" at 25y). When zeroing at 25 yard, if your impacts are 2 inches low and 1 inch right, you will need to adjust Elevation 8 clicks UP(counterclockwise) and 4 clicks LEFT (clockwise). The maximum adjustment range is ±30MOA.
You can get the 507k in both red or green dot versions. If you are unsure of choosing red or green, green is a little bit brighter and easier for the eye to pick up. To learn more of the science see our guide on choosing red vs green dot here.
Holosun provides a limited lifetime warranty from the date of purchase on parts and workmanship. At Holosun’s sole discretion they will repair or replace products found to be defective under normal use without charge. They do exclude the delivery costs, which is the responsibility of the purchaser. The warranty is void if the green dot sight has been misused, modified, neglected, or disassembled prior to its return.
How do you change reticles? Hold the "-" button down 3 seconds to switch between the three reticles (Circle +Dot, Dot and Circle) in that order.
How do you zero in the dot? The sight has been factory zeroed to approximately 25yards and should require minimal adjustment to achieve zero. To adjust, use the provided turret adjustment tool, each click is 1 MOA. Elevation is at the top and windage is on the side.
Does it remember my brightness setting? Yes the 507K-GR will turn on to your last brightness setting used.
What is the footprint the 507K-GR uses? Holosun 507K-GR is compatible with Shield RMSc/RMS/RMSw/SMS, Sig Romeo Zero Optics
When installing, what should I tighten the screws to? Tighten the screws to 15 inch/lbs using screws with a non-permanent thread locker, like blue Loctite.
How do you turn the 507K-GR on? You press and release either brightness button to turn on the sight (“+” or “-”).
How do you turn the 507K-GR off? Press and hold both brightness buttons simultaneously to the turn the power and motion sensor off, this will also disable the Shake Awake feature.
How do I activate Lock Mode? Hold the “+” brightness button for 3 seconds, the LED will blink once to activate Lock Mode.
How do I turn off Lock Mode? To turn off Lock Mode hold the “+” brightness button for 3 seconds, the LED will blink once to confirm Lock Mode is deactivated.
How can I adjust the sleep timer? By default the sleep timer of the Shake Awake feature is set to 10 minutes. You can adjust this time by holding the “+” brightness button for 10 seconds. Press and releases either brightness button to set the time, the LED will blink 1 time for 10 minutes, 2 times for 1 hour, 3 times for 12 hours, or 4 times to disable sleep mode. Then press and hold both brightness buttons to save the time setting and power off the sight.
Why is my reticle blinking slowly? If the battery voltage is below 2.2Vdc, the reticle will blink slowly to indicate it needs a new CR1632 battery.
How do I change the battery on the optic? The battery tray is located on the side, simply unscrew the tray and replace using a CR1632 battery.
Does this also come in Red? Yes