When Lilly is blocked by the large guy approximately halfway through the episode, he pulls out a pistol that is clearly a Glock. After Lilly takes the gun and he tells her it has no bullets, she pulls the trigger multiple times and a click can be heard with each trigger pull. That type of pistol is a striker fired gun and the trigger would only click once and she would have to pull the back the slide to reset the trigger to make it click again.