Um, no. Open carrying a firearm is one thing, using a firearm to intimidate a person unlawfully is illegal. As I and others have pointed out, unless proof comes out otherwise, the McMichaels had no legal standing on attempting to stop Arbery. None. By involving firearms they escalated it to a felony false imprisonment attempt. It does not matter what Arbery might or might not have done at that point. Citizens are not LEO's, they don't have the power to stop people to investigate crimes. They can only enact a C/A when they have witnessed or are witnessing a crime being committed, and in the state of GA that crime has to rise to a felony level to enact a C/A.
So Arbery has the right to charge, assault, and attempt to disarm the younger McMichaels when he had obvious options? Nope, and he died doing it.