I don't know but I find the carrot anecdote interesting. I wouldn't think that a gun based on the ion platform would even be able to do that. I know I like to screw with the kiddies at the field with the finger down the feedneck bit. I've yet to see any gun, even cheap blowbacks, that would do actual harm- maybe pinch but not actually hurt.
You may want to ask over on the
Tinkering Tech forum. There are a few guys over there that work intimately with ion internals and have expressed interest in the SP-1 and Vibe.