: Putting the magazine on the right side of the weapon would make for a very
: awkward mag change for right handed shooters. That does look like a
: magazine floor plate on the bottom of the grip, but it doesn't align well
: with the receiver since the grip has that angle change near the top. I
: can't picture it.

: And the Halo SMG uses caseless ammunition, if I remember correctly.

I think they've just made it reload like a P90. The magazine goes directly on top. That's what I'm seeing anyways.