The flintlock ignition system came into use during the 1600’s. It consists of a sharp flint held firmly in the jaws of the cock. When the trigger is pulled the cock is released to move forward and down, the sharp edge of the flint scrapes the steel frizzen, simultaneously opening the pan and throwing a shower of hot sparks into the priming charge. The hot gases from the burning priming charge travel through a small flash hole drilled through the side of the barrel to ignite the main powder charge.