The Particle Projection Cannon is a item/weapon/gun in the MechWarrior/Battle Tech series.
The Particle Projector Cannon (or PPC) is a unique energy weapon. PPCs fire a concentrated stream of protons or ions at a target, causing damage through both thermal and kinetic energy.As such, despite being an energy weapon, it produces recoil. The lethality of the weapon rivals that of a higher-caliber autocannon; just three shots from a PPC will vaporize two tons of standard military-grade armor. Targets hit by multiple, simultaneous PPCs can also suffer electrical side-effects, such as overloaded computer systems or targeting sensors. The ion beam also extends to much farther ranges than autocannon fire, though PPCs generate large amounts of waste heat.