Excellent quality sight - Holosun HS507K X2 Compact Pistol 2x 0.58 x 0.77 in Reflex Red Dot Sight

Holosun Sight mounted easily with no problem and works well. My only two complaints would be that the battery was DOA and that the actual dot isn't the "arrow" shaped image as pictured on the side of the dot which can be used as a guide foe longer range shots.