Patent ID: 8783152

Claim:
A reduced energy cartridge for use with a dedicated training firearm or firearm modified to a training configuration, the cartridge comprising: a piston sleeve defining a projectile cavity at a longitudinal end, a projectile coupled therein, and a cylindrical cavity at a second end for coupling with a primary case, wherein the sleeve further comprises an inwardly extending wall separating the projectile cavity and the cylindrical cavity at the second end, the inwardly extending wall having a central axial cylindrical bore defining a flash hole connecting the projectile cavity with the second end; and the primary case configured as a piston and being coupled with the second end of the piston sleeve, the primary case defining a primary case cavity for coupling with a propellant unit, a propellant coupled led in the primary creating a quantity of propellant gas, the primary case further defining a central axial channel for conveying the quantity of propellant gas from the propellant unit when it is created in the primary case cavity to the flash hole and to the projectile in the projectile cavity, wherein the central axial channel is aligned with the flash hole along a central longitudinal axis such that the quantity of propellant gas when created is conveyed substantially along the central longitudinal axis from the propellant unit, and the piston sleeve and primary case providing a direct open pathway along said central longitudinal axis all of the way between the propellant unit and the projectile, the primary case having an O-ring engaged with the cylindrical cavity, and wherein the projectile has a recess shaped to capture a portion of the quantity of gas when created by the propellant unit.