It shows how a single object can serve as a connection between many different characters (or nodes in a network) who don't necessarily need to know each other. Even though the rifle is not passed on any further, it continues to influence the characters' lives in significant ways. This demonstrates how the smallest actions on one side of the world can ultimately lead to a complete change of another person's life elsewhere, without there being any form of direct contact between the two (also see Butterfly effect).