Answer:
The quote in question comes from chapter twenty-one from Harper Lee's novel "To Kill a Mockingbird".
The empty gun signifies Atticus's actions of trying to defend Tom Robinson knowing he had tried his best and tried extremely hard, despite knowing the whole time the case was on that there was no chance that he will win the case.
Step-by-step explanation:
The empty gun signifies Atticus's actions of trying to defend Tom Robinson knowing he had tried his best and tried extremely hard, despite knowing the whole time the case was on that there was no chance that he will win the case.