Primer Housing for Firearms and Other Munitions

A firearm cartridge, comprising:

• a casing having a sidewall, a front end, and a back end, the back end defining a primer pocket therein, the primer pocket having a side surface;
• a primer, comprising:
• a disk having a first face, a second face, and an edge defined between the first face and second face, the second face having a larger cross sectional area than the first face, the edge having a pressure-resisting configuration, the second face of the disk having an ignitable material thereon;
• a retention piece having an open end, a closed end, and a side wall extending therebetween, the open end being dimensioned and configured to substantially match the second face of the disk, the closed end having a larger cross sectional area than the open end, a portion of the side wall having a pressure-resisting configuration, the retention piece defining a recess within the open end, the retention piece further defining a central axis extending between the open end and the closed end, the retention piece defining a plurality of channels extending from the recess to the closed end, the channels being angled from parallel to the central axis;
• and
• the side surface of the primer pocket having a shape that substantially matches the pressure-resisting configuration of the disk and the pressure-resisting configuration of the retention piece;
• whereby movement of the retention ring and disk caused by pressure inside the casing is resisted by interaction of the side surface of the primer pocket with the pressure-resisting surfaces of the disk and retention piece.