I'm thinking of 11 new components for weapons:
RUST: chemical subtance put rust on foe robot joints, hence slowing the robot.
GLUE: sticking some joints of the foe robot, he can only go straight forward or back or stop but can't change of direction.
BANANA SKIN (or OIL): the joints become slippery so the foe robot have erratic (random) moves.
EMI ARROW: electromagnetic interference make the foe robot go in a wrong direction when told to move.
TAP (or SAND GRAIN): one foe weapon is jammed and can't fire.
HOURGLASS: the foes weapons fire at a slow rate.
TOY FIRE: decrease the foes weapon damage.
BOOMERANG (or MIRROR or LOOPBACK): return his ammo against the foe.
LENS (or MAGNET): deflect (curve) trajectories of foe's ammo.(always the same way: to the right for instance)
CONVERTER: absorb energy of ammo to reload buckler (but let damage).
TERROR: when foe robot is hit by fire he goes back.
They can be active for a period of time increasing with the component level. Or the intensity of the effect increase with the level.