I’ve been thinking about Bucky’s robot arm a lot (hi have we met), so I figured I might as well collect all my thoughts in one place, since they might be interesting/useful to other people. I organized this as a q&a, but obviously these are just my answers based on what we’ve seen in the MCU. I’d be really interested in what other people think, or if anyone has other questions they want me to speculate on.
Edited 15 October 2014.
BUCKY’S ARM: A HEADCANON