Take a look at this ebay auction
http://www.ebay.com/itm/Quality-repr...item2eb981da89
Do not consider the scabbard and try to focus on the blade markings.
In the following picture on the left is a genuine australian contract M9, on the right the bayonet from the above auction
I'm shocked as I am not able to see any difference (apart from a small alignment problem) in the blade markings between the two.