The HS407K X2 is an open reflex optical sight designed for subcompact pistol applications. Additional features include Holosun's Red Super LED with up to 50k hour battery life, a crisp 6MOA dot, 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 HS407K X2 is a direct for P365X/XL, and requires an adapter plate for slides with a four-boss interface.