[url=http://i394.photobucket.com/albums/pp25/Hayabuza753/SMG2.gif]They still reload the same.[/url]
Maybe Treyarch looked at the Halo SMG and really liked it and that's how they made the PDW-57.
I doubt it. They probably just looked at some weapon systems that are currently in development and decided to put them in the game as finished products just as they have done with previous CoDs.
I dunno. Have you ever used the SMG in any of the Halo games? If you have then you should know that the magazine is attached to the left hand side of the gun and not underneath.