I would say the BAR would be classified as a "battle rifle" because it is automatic and fires a full sized service round.
Like the FN-FAL, G-3, M-14, etc.
NRA Life Member
Me: "The .45 GAP was an answer to the question nobody asked."
Trooper pal: "Says the guy who thinks .38 Super and 10mm are viable pistol calibers and gets mad when Wal-Mart doesn't have them."