Dude said he has a 16" .223. I think he has a 5.56 (similar, but different). He may have a 14.4" w/perm brake or perm FS (similar, but different, ATF considers it 16").
If BM says the only special run currently is a 14.5, then I guess thats all that's out there right now. No telling if or when another run will come along. No telling what's out there from previous runs. Like the numbered flat top uppers, when they were gone, they were gone. Never cataloged, either.
If you "gotta have" a BM 16" 1 in 7, buy a 20" and have Kurt cut it down for you. He works the gas port so it is reliable. It's like a dissipator, but only has one FSB instead of one shaved and one for the sight, calls it the KurtsGewehr. I have been more than pleased with the work he has done for me (other stuff, haven't had that done).