More importantly, since the Firearms Amendment Act of 1997 pretty much banned the ownership of handguns, so in theory, other than antiques and de-acts, there shouldn't be any in private ownership.
Offtopic but please be careful how you use them, I have family who are Armed Response Vehicle crew and get called out to people using replicas. Don't forget the public generally panic when they see a gun (I know, as a former member of the Great Britain shooting team). Make sure the police know what you are doing and where, you don't want to be looking down the wrong end of a G36 if the ARVs turn up.