Practice firearm

Claim 1

FOR USE IN A FIREARM HAVING A FIRING PIN MOVABLE A PREDETERMINED DISTANCE BETWEEN COCKED AND FIRING POSITIONS, THE COMBINATION COMPRISING MEANS DEFINING THE FORWARD PORTION OF A FIRING CHAMBER HAVING A REARWARDLY FACING TRANSAXIAL SURFACE FOR ABUTMENT BY A CARTRIDGE RIM TO DETERMINE THE SEATED POSITION THEREOF, AND A RECOIL PLATE HAVING A FORWARDLY OPENING RECESS THEREIN DEFINING THE REARWARD PORTION OF THE FIRING CHAMBER IN AXIAL ALIGNMENT WITH SAID FORWARD PORTION THEREOF, SAID RECOIL PLATE INCLUDING AT LEAST ONE SURFACE DEFINING A PORTION OF SAID RECESS FOR ENGAGING THE REAR END OF A CONVENTIONAL CARTRIDGE INSERTED IN SAID FIRING CHAMBER AND HOLDING SAID CARTRIDGE AGAINST SAID TRANSAXIAL SURFACE SO THAT THE REAR END OF SAID CARTRIDGE IS SPACED A PREDETERMINED DISTANCE FORWARDLY OF THE FIRING POSITION OF THE FIRING PIN, SAID SURFACE OF THE RECOIL PLATE BEING ADAPTED TO COOPERATE WITH A COMPLEMENTALLY FORMED SAFETY CARTRIDGE TO PERMIT THE REAR END OF THE SAFETY CARTRIDGE TO PROJECT REARWARDLY WITHIN SAID RECESS TO THE FIRING POSITION OF SAID FIRING PIN.