AR-15: Who are you?
Musket: I'm you, but from another timeline.
Alright, listen up, genius. The joke is about an AR-15 meeting a musket. The musket says it's the AR-15 from a different timeline. Get it? It's like saying, "I'm you, but old-timey and way less effective." Which, let's be real, is still probably more useful than you are at parties.