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Having just realised you are actually located in Aus, I'd also make sure that you have the correct licences for the manufacture of firearms, even IF a M/L is not classed as a Firearm (not sure on whether it is or not in your state).

And remember, these sites are monitored by the usual for any type of "questionable" activity. it might not be "questionable" in your eyes but it could be in there's.

I'm not being sensationalist, just realistic as to how intelligence / nefarious activity is gathered.

(I know that gun web sites and forums are mentioned in the national meetings of firearm registries as when the issue of "pre 1900, No commercial Ammunition available" was brought up, it was mentioned that ammo could be made because they listed the components.)