Corraza is a manufacturer that never made it to the game.
The Corraza prefixes are Standard, Revised, Special, Choice, Prime, from low to high.
- NOTE: EVERYTHING BEYOND THIS POINT IS PURE SPECULATION.
Similar to how Anshin's grenade mod steals health, it is quite possible that Corraza was supposed to sap shield charge from enemies, before presumably adding it to your own, effectively making it a shield counterpart to Anshin items. This manufacturer was cut because of the uselessness of before stated properties, presumably due to the easiness to deplete the shields of enemies, and the fact that shields themselves recharge.
Corraza is Italian for a cuirass or a carapace, so it is possible this manufacturer was supposed to be one of the item-only manufacturers, only making shields, class mods and grenades.