Abstract: A rifled weapon barrel has increases the piezometric efficiency of the weapon system with varying rifling profiles throughout the barrel to maximize useful work out of the propellant gases. The weapon barrel includes a first rifling section at the breech end which progressively increases in twist rate to induce a torque spike on the projectile and maximize chamber pressure. Next, the weapon barrel includes a second rifling section which progressively decreases the twist rate to a level that may be unsuitable for aerodynamic stability but provides relief from the torque spike while minimizing pressure loss behind the projectile. Finally, the rifle then maintains this twist rate or decreases to increase stability of the projectile before exit.

Abstract: A one man portable electronic pulse generator includes a standard rifle having a muzzle and capable of firing a blank cartridge containing propellant. A blank firing adapter is fixed to the muzzle of the rifle. A piezoelectric generator is aligned with the gas exit orifice of the blank firing adapter. A lead cable is electrically connected from the piezoelectric generator to a unit in series with said lead cable for storing or utilizing said electronic pulse.