The LJ-50 Concussion Rifle was a concussion rifle used by Trandoshan mercenaries during the Clone Wars. They were used aboard the RAS Prosecutor against Delta Squad and also used against the squad on Kashyyyk.
The LJ-50 was incredibly unreliable, as weapon go, and the firing mechanisms often jammed. However, the weapon itself was incredibly powerful when it worked. The rifle carried enough power per cell to fire five shots, and two cells could be easily carried at one time.