The Mark IIIs have a receiver tube that is longer than the one ont a Mark II. There are more transferrable Mark IIs around, so the parts for them are more in demand. I've read that Mark IIs are easier for those with a Manufacturer's License to make into post samples. I guess some of the parts interchange between the models and some don't.
Some kits I've seen advertised come with mags, some don't. All have the receivers torch cut in enough places to make them "parts" rather than guns.
HTH.
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"To disarm the people (is) the best & most effectual way to enslave them." George Mason.
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