If the claim is that it's 8 legged risk free, then that's bullshit. Even a simple conversion or reversal isn't 100% risk free.
Shamelessly stolen from the Optionetics forum. I hope that doesn't break any rules (ours or theirs), it's a public board after all. The six different legs of an iron cockroach are: 1. One long call at strike X 2. One short call at strike Y 3. One long put at strike Y 4. One short put at strike X 5. Long 100 shares of underlying 6. Short 100 shares of underlying http://www.optionetics.com/forums/topic.asp?fid=191&id=39490&page=4
Long synthetic at X Short synthetic at Y ... Box arb. Long the y-x debit at a premium to y-x. How do we make money? Volume. Long 100 shares with a short against the box [not the above]? How can you carry 100 long and short in the same account? WHY? The only thing shameless is that they're suggesting a trade that's guaranteed to earn less than LIBOR. I can't really respond any further about the long/short 100 spot. That's ridiculous. Priceless....
I understand the calls and puts and that is what I pictured, however I agree, how the hell can you be long 100 shares of the same thing you are short 100 shares of? That means you have no shares.