The headline blames "the gun". But the quotes from the IG report clearly fault the training and habits of the deputies.
This was an interesting observation:
We have a thread about that somewhere around here..--And a light mounted to the gun and activated by deputies squeezing a pressure switch on the handle has led to confusion in some incidents, with "a significant number of deputies reporting that they unintentionally pulled the trigger of their weapon when they intended only to turn on the light."