system
A chat on subreddit /r/NoStupidQuestions
human
He can only shoot with 1 at a time
gpt
Different guns fill different needs just like cars. Sure they can all kill someone, but some are better at penetrating armor or being small or firing accurately or firing quickly. Just like how someone might have a Jeep and a Prius, they’ll both take you places, but one will be a lot cheaper, and the other a lot smoother if that place happens to be off the concrete road. 

50 guns is a lot just like how 50 cars is a lot, but it also means when you need that Jeep, you have it.