IIRC the ones that ambushed Nanoha (wait, is it Type IV or VI?) was not Scaglietti made, just like the ones in the Cradle was owned by the ship itself. Unfortunately, I don't think it was ever properly explained why there was Drones in the middle of nowhere; my guess is that they're guardians of old ruins and artifacts or something.
About Gadget Drones and AMF...well Scaglietti is a clone of an Alhazardi, but I don't know whether it was because he's a brilliant Alhazardi or because he has ancient techs buried in his mind - or maybe both.
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