I'm beat, but spent the last hour or so, capturing images that address the magazine compatibility issue. Hang onto those 450b mags. Like the south, they will rise again, in the 30RAR. More on this, hopefully tomorrow when I edit and write up in a separate "Magazine" thread. BTW, despite how totally crazy the factory 30RAR mag looks, it cycles the 450b ,much smoother than any variation on a 5.56 mag shell I've seen to date and I have 4 versions of 450b mags. Still looks like it was designed by a "Drunk Irishman" though.
Hoot