Now 18, the Long Beach, N.Y., native handled the brief controversy with aplomb.
"We laughed it off," McAvoy said during Bruins development camp at Ristuccia Arena. "Because that's what it is, it's funny. Anyone who can't really get past the fact that when I was [15] I was a Rangers fan, then I don't even know what to tell them.
"My heart is with the Bruins now. I'm die-hard Bruins. These are the people that had faith in me and wanted me to be a part of the organization. It's obvious why I'm a Bruins fan now."
The feeling is mutual. Last season, as the youngest player in NCAA Division I men's hockey, McAvoy thrived with 25 points in 37 games as a Boston University freshman. He gained international experience by representing the United States at the IIHF World Junior Championship and later was selected to the Hockey East All-Rookie Team.
The 6-foot, 207-pound right-handed shot was a perfect fit for the Bruins' needs when the 14th pick came up because of his proximity to the organization and his skill set for a franchise looking to shore up its defense for the near and distant future.