A spinning drum you might say?
Whether it's a bar, disc, drum. They're all largely similar.
Edited my post,
Yeah its a spinning drum but it didn't have anywhere near the range of something like carbide. There was a few times it was against the side of a robot without inflicting damage, sometimes it seemed to have to be almost underneath a robot for the weapon to do damage. Had it been a bigger drum it could have done more damage, just seemed too flush to the bodyshell of the robot to be really effective.
That and it could only move 5 feet before stopping dead
