A fast acting charge pump is provided which is suitable for use in a locked loop circuit where very short duration first and second adjustment pulses are produced by a phase detector. At least one gate member is pivotally mounted at an open end of a monoblock and has a first blocking member to inhibit feeding of an end cartridge from a feed port until the firearm is cocked. The first RF antenna element is located proximate to the tag antenna and the second RF antenna element is located proximate to the reader antenna.