Heavy-duty variant of the CompC built for extreme conditions. This sight has a special hard-anodize surface and the specification for water tightness up to a depth of 75 feet. The high quality requirements that are designed to cope with frequent professional use on the type of gun that is typically used by the police and the military or for hunting under extreme conditions. The CompM2 is compatible with 3rd generation night vision devices but is otherwise identical in construction to the CompML2. On the M2's switch there is no "off" position necessary since the battery life is ten years with the power set on the lowest setting.