[Jack Simth]

Not quite - Bracers of Armor and Mage Armor both provide an Armor bonus - they don't stack. A Ring of Protection (Deflection bonus) would stack with a casting of Mage Armor, an Amulet of Natural Armor (Natural Armor enhancement) would stack with a casting of Mage Armor, a Dusty Rose Prisim Ioun Stone (Insight Bonus) would stack with a casting of Mage Armor, but Bracers of Armor would not. Jason's Shield spell would stack with either, but it's a Personal spell (and only lasts 1 min/level). However, he could put a few Shield spells into the ring of spell storing (which would then be reduced to caster level 1st), and you could use a standard action at the beginning of combat to cast it - granting a +4 Shield bonus to AC for 10 rounds (more than the length of most combats, really).