Tim Seely seems really to like these "Arm Blades" he Jason use them again in the He-Man Injustice crossover.
I've seen that too and was surprised that someone remembered Jason's arm blades.
How often did Jason use them in RHatO? I only remember that scene at the very beginning of the old RHatO run (issue 2?) when he used them for "gliding" through the secret All-Caste entrance (although I don't understand how that could work).