Re-activate an SMLE Mk4

Also, be very careful if you enter Australia in a state in which you do not reside.  In particular, Western Australia.

I would start email both the licensing services in your state police force and border force to ensure it isn't seized and destroyed on arrival.

I saw this picture and I feel I must say that looks like an Uk deactivation specificaton , The action will have been removed from the wood work and inverted and clamped onto the bed of a miller then using  a minimum of a 1/3 bore diameter cutter used to cut from the mag well through the feed ramp chamber wall and at least 3/4 the length of the barrel concealed by the wood work, Then a steel rod had to be welded from chamber for 3/4 of the barrel length .

 Then a hole was drilled through from one side of the action through the chamber but not through the other side of the action( blind hole) and a hardened steel  rod inserted across and though the action/chamber and then welded in.

In no way would this be safe to use for the original chambering.

am i mistaken or didnt i see receiver mounted rear sight on the OPs rifle , i think it was a no 4 not a mkIV , which also makes it NOT an SMLE ,