Reports are the primary is effective when fired aimed for center mass, but only within 300 meters, the knife has proven useful mostly for basic utility in that it's a giant knife on a giant humanoid robot, which isn't surprising, it can saw suspension bridge cables and cut into industrial silos.
Some combat encounters however report that the enemy is producing look alikes for false flags, this is being investigated but we believe the key differentiators are in the external ventilation ports, the active scan frequencies on the sensor suite and less noticable discrepancies in external plate and weapon design.