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The neck joints do indeed seem to be a major weakness for B1s and even BX droid commandos.In TPM, one's head actually falls off when they're shut down. The Clone Wars era B1s are upgraded to be autonomous, but that's it, so I could see their necks being weaker.
The latter can take out ARC troopers with a single twirling blow and take a lot of punishment in the torso. But on one occasion Rex took one out by yanking at and twisting its neck.