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Is this allowed? Assaulting the turn you show up from outflank / reserves / deepstrike?

In regular 40k - no, in apoc, by some assets and formations - yes.

This is where i have to ask... which page? I have been looking the rules over like crazy and i can´t find this point in the rules anymore.

I believe it's under "Coming in from reserves".

Page 136, first top left paragraph.

Its in the rules for Deep Strike, fourth paragraph after the bullet points under the heading 'Arriving by Deep Strike' starting with "In that turn's Assault phase..."

You are both perfectly right, and i´m perfectly blind thanks