During the scene where Electra's father is killed, Electra picks up a Glock (model is irrelevant), and begins shooting at Daredevil. First, I counted 16 shots, (which is possible, if you can get your hands on a law enforcement 15 round magazine + 1 in the chamber). The problem is, when all rounds are expended, she pulls the trigger 3 times, to which 3 "clicks" are heard.

When the last round is expended in a Glock, the slide automatically locks to the rear, which was not the case here.