A system for precision aiming of a weapon that has a rail, aligned with a centerline of its barrel, with a bus for supplying power to, and providing communication between, a plurality of modular system components that are mounted and precisely aligned in an array on the rail. The body includes straps or arms to allow the mask to be temporarily attached to the user’s head and is designed to provide a light omitting cover for the user’s eyes. The hydraulic pump draws low pressure fluid from a sump and delivers high pressure fluid to a series of actuation chambers defined between coaxially aligned first and second components of the rotary operator. A modulator is configured to control conductance between the first and second materials to generate a detectable signal that is partially defined by the current flow extending through the conductive fluid.