Holosun HS507K Compact Pistol Reflex Red Dot Sight 2x 0.58 x 0.77 in MOA Red ACSS Vulcan Reticle Black. The Holosun HS507K X2 improves on the previous version by adding Lock Mode which was first introduced in our 2018 LEM pistol optic models. Lock Mode when activated locks the buttons preventing inadvertent setting changes. Additional features of these Red Dot Sights include Holosun s Red Super LED with up to 50k hour battery life Multi-Reticle System and Shake Awake. The durable housing is made from 7075 Aluminum uses Holosun s K footprint and houses the 1632 battery in a side-mounted tray for easy replacement when needed. The HS507K X2 is a direct for P365X/XL and requires an adapter plate for slides with a four-boss interface. Specifications for Holosun HS507K X2 Compact Pistol 2x 0.58 x 0.77 in Reflex Red Dot Sight: Manufacturer: Holosun Color: Black Fabric/Material: 7075-T6 Aluminum Magnification: 1 x Objective Lens Diameter: 0.58 - 0.77 in Objective Window Size: 0.58x0.77 in Illumination Type: LED Illumination Color: Red Eye Relief: Unlimited Adjustment Type: MOA Adjustment Click Value: 1 MOA Optical Coating: Multicoated Battery Type: CR1632 Battery Quantity: 1 Battery Life: 50000 hours Water Resistance Level: IP67 Weight: 1 oz Condition: New Magnification Type: Fixed Quantity: 1 Red Dot Sights-Footprint: RMS Features of Holosun HS507K X2 Compact Pistol 2x 0.58 x 0.77 in Reflex Red Dot Sight: Ultra-compact size for concealed carry applications Two Reticle Settings: Dot + Circle and Dot only Shake Awake - Motion on with last setting recall Parallax-free unlimited eye relief 10 daylight and 2 night vision compatible brightness settings IP67 Certified Package Contents: Holosun HS507K X2 Reflex Red Dot Sight Holosun HS507K-X2-ACSS: HS507K Compact Pistol Red Dot Sight 3 MOA Red ACSS Vulcan Reticle Black