Graven Games put up a review of the Angron, Primarch of the World Eaters model from Forge World.
From the review:
Along with the release of the first Horus Heresy book, Betrayal, from Forge World we have also seen the release of the first official Primarch miniature. This model is Angron Primarch of the 12th legion of the adeptus astartes, The World Eaters. Angron was one of the 3 primarchs that joined Horus in purging their own legions of Imperial loyalists at Isstvan III ,also referred to as the Isstvan atrocity, before declaring war upon the Emperor of mankind and his loyal legions.