A processor executes image processing under control of a clock facility, such that a sequence of C effective clock cycles will effect a processing operation of a predetermined amount of image information. The mounting bar includes multiple grooves spaced apart at incremental distances for mounting the telescopic sight at a selected height above the firearm. The retaining mechanism is arranged tightly between the rib and the first part to impart force against the first part to retain it against the surface of the second part. A cam on a pivotable lever causes the bay to move the fluid connector components into and out of engagement. The voltage node is maintained at substantially the output voltage.