Quick  update to show a little bit of physics progress on Primitives. Click 'e' while mousing over the "Gun" to equip it, per-se, it will then follow the mouse cursor. It's a little hacked but I think it works pretty decent for now, or until i an figure out a better way to do it.

https://docs.google.com/open?id=0B3iGA1KoiI7fSDd6S29sNDA3cG8