a firearm which alloys center fire cartridges , rim fire cartridges of different sizes and types , as well as , black powder loads of different sizes to be fired from the same firearm . the aforestated is accomplished by the present invention entailing three firing pins which are selectively controlled by setting the triple mode selector located on the hammer to the desired setting . the aforementioned firearm has an internal firing mechanism lock which locks the internal firing mechanism and renders the firing mechanism inoperative . the internal firing mechanism lock is actuated by a key which can easily be carried on one &# 39 ; s person .