I recently purchased the item level 32 Stamina and Firearms Gear Mod blueprints and crafted four of one and three of the other. All seven were Prototypes and had either Skill Haste or Exotic Damage Resistance for their random bonus, but I really need Armor.
I've gotten several Advanced versions as drops in the DZ with Armor and other bonuses, but I don't recall picking up any Prototypes with Armor. I don't want to keep wasting materials if getting Armor on these Prototypes is impossible.
Is each level of item (Advanced vs. Prototype) restricted in the possible secondary random bonuses they can have? Is there a list compiled from anecdotal evidence?