I emailed Amy Sayers at Caspian a few days ago concerning the .40 hi cap mags and this was her reply:
Thank you for your inquiry! The delivery dates keep getting upped on us for the magazine tubes, sorry. The latest we had was end of April. Sorry I really don't have anything else for you. Keep checking back for updates.
I hope that date doesnt keep getting extended. It could be a very long April.