User blog comment:B214/Question and Answers 2/@comment-4547267-20140604230500/@comment-24866657-20140605002607

@B214

I don't think so, if Issei lost his left arm then Boosted Gear would manifest on his right arm, if he lost both arms then it would manifest on his legs or somewhere else, or it would become another sub-species like Siegfried where Issei grows a dragon arm on his body, this dragon could be armored, too. That's how sacred gear works.