The HE407K-GR X2 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 the 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 Green LED with up to 50k hours battery life, and Shake Awake. The HS407K X2 is a direct mount for the Sig Sauer P365X/XL, and requires an adapter plate for slides with a four-boss interface.FeaturesLock ModeRedesigned Buttons50k Hours of Battery LifeShake Awake12 Brightness Settings: 10 DL & 2 NV CompatibleConvenient Side-mounted Battery CompartmentParallax-free & Unlimited Eye ReliefHolosun K Footprint