Usually the robot does a little "Aaaah my arm!" animation whenever the left arm is cut off, no matter the weapon in hand.
Except Archer robots. They have all their RAM stored in the left arm, and they die if it's cut.
Viewing post in Player change model with upgrades
One day, in the Archer Building/Training Facility...
(MK3 Combat Archer) Welcome trainees! Today, we'll learn about bow-wielding basics!
(MK1 Combat Archers) SIR, YES SIR!
(MK3 Combat Archer) You don't have to say "sir, yes sir" for everything...
(MK1 Combat Archers) SIR, YES SIR!
(MK3 Combat Archer) Anyways, most importantly, never, and I say NEVER lose your left arm! A big part of your mind is stored there, so, if you lose it, you'll DIE! Who wants to demonstrate it?
(MK1 Combat Archer #759273982759) ME!
(MK3 Combat Archer) Well then... *chops MK1 Combat Archer #759273982759's left arm off, he instantly falls to the ground*
(MK3 Combat Archer) Dismissed! NOW GO TRAIN YOUR AIMING, BECAUSE IT'S WORSE THAN A BLIND HUMAN WITH A BROKEN BOW!