LOL - FACT!
You and i both know the facts. I am simply pointing out that from a manufacturing standpoint, putting a 12" barrel 300blk is not in the works. Realize that this was an order from Epps, not a standard issue from BCL. So BD for Epps have decided that the 16 or 16.5 barrel would sell faster than a 12" barrel.
As for the proprietary mag, if BCL does issue one, they will have to modify the chassis (unless it has been premodified during the initial runs - which i highly doubt) so that a proprietary mag and AR mag cannot be used in the same rifle - otherwise, it's just another AR mag.