Why no paslode full head framing nails?

I got some 30 degree paper tape paslode nails off ebay a while back which were from an Aus source shop but nails were imported from US. Thing is that these nails have a full size offset head - not a D head. Why can't you buy similar in Aust hardware shops? Have they different building codes in the US? Seems a no-brainer that a full head nail is better than half a head.

Source: http://www.woodworkforums.com/f13/why-no-paslode-full-head-framing-nails-157949/

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