Is a licence/permit required to make a telescopic sight adapter in WA?

A relative has asked me if I can make an adapter that attaches a telescopic sight to a bracket that mounts onto a licenced rifle.
SO
1) Sight, 2) Adapter, 3) Bracket and 4) Rifle
Relaltive said he will purchase 1) and 3) and already has 4)

The relative knows he will have to get a licenced gunsmith to fit all the bits together onto the rifle.

The question is does this constitute "gunsmithing" and would I need a permit or licence make this in WA?

I'd rather not get into whether it should be right or wrong - just need some kind of clarity whether I can or not.

Thanks


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