As far as I know, this is the first time that Bullseye's adamantium-reinforced skeleton has been referenced since it was introduced in Guardian Devil. However, I'm aware that I'm sorely lacking in information about Bullseye, not being a regular reader of Daredevil titles. Does anyone know whether A) Bullseye's adamantium was in fact introduced before Guardian Devil, or B) it's been mentioned between then and now?