All of his abilities mentioned in the guide are specific to magic missile, they don't affect any other spells. The class does get the ability to cast shield as an immediate action and lets his shield reflect magic missile spells back at their caster instead of negating them.
Metamagic Specialist Sorcerer 6/Force Missile Mage 5/Argent Savant 5/Abjurant Champion 4
You have MAGIC MISSILE. You have SHIELD FOR DAYS. You have MAGE ARMOR, at least until you swap it out for GREATER LUMINOUS ARMOR! Congratulations! You are a force to be reckoned with!
But wait, there's more!
When someone thinks that they've got a shot at you, you can flash your WINGS OF Cover! If you're surrounded, unleash WINGS OF FUCKING FLURRY! Confound your enemies by PREPARING EXPLOSIVE RUNES TODAY! When someone with SR comes along, you can go bowling with ORB OF FORCE! Tell melee brutes to take a hike with Forcewave! Take a bite out of crime with MANYJAWS! Floor your enemies with HOWLING CHAIN! Engulf your foes with MAW OF CHAOS! Unleash a MACROSS MISSILE MASSACRE with your GREATER ARCANE FUSION ARCANE FUSION SPELLSURGE OF MAGICAL MISSILY DEATH.
You can even go RECURSIVE on that BITCH with ARCANE FUSIONS in ARCANE FUSIONS. DON'T BELIEVE ME?
Page 96 – Arcane Fusion [Addition] Include clause, “If applying a metamagic feat to a spell, use the adjusted spell level and casting time for purposes of determining eligibility for Arcane Fusion.”
Yo dawg. I heard you liked MAGIC MISSILE, so I put some MAGIC MISSILE in your MAGIC MISSILE so you could MAGIC MISSILE while you MAGIC MISSILE. Step aside, TWIN and REPEAT SPELL! SANCTUM SPELL for ALL OF THE MAGIC MISSILES!
Magic Missile. For when you absolutely, positively got to kill every motherfucker in the room, accept no substitutes.