"ATF has stated..." Who in ATF? By letter from ATF HQ or the word of a field agent? Like the agency they were once a part of, IRS, BATFE people can tell you anything but you cannot rely on their words or advice. In any such questions, get it in writing.
I have no idea why a Browning 1903 pistol would not be a C&R and if it is not, it should be importable to an FFL 01 dealer. The AR-15 is probably non-importable under a law dating to before the (now expired) AWB.