I started out playing Special Ops, and unlocked a few guns and gained rank. I wasn't really paying attention when I dove into Multiplayer... But does anyone know if what you achieve in Special Ops transfers to Multi-player leveling?
No, Spec Ops has its own leveling and unlock system. The leveling and unlocks in multiplayer are unrelated. In fact, I believe that there are some guns that are only in Spec Ops, and others that are only in multiplayer.