HOLOSUN RED DOT SIGHT - The HS407K X2 is an open reflex optical sight designed for subcompact pistol applications; It features Red Super LED with up to 50k hour battery life, a crisp 6MOA dot, and 12 reticle intensity settings; The HS407K X2 is direct for P365X/XL, and requires an adapter plate for slides with a four-boss interface