Ultramarine Locutarus Assault Marines.
A Locutarus Storm Squad was an elite specialised assault formation utilised exclusively by the Ultramarine Legion during the 30th and 31st Millennium. These elite units were maintained in small numbers by the majority of Chapters within the Ultramarines Legion, and deployed particularly in vanguard and strike formations.
Each warrior of the Locutarus had been selected from the line assault squads having proven themselves the most skilled, courageous and ferocious of their brethren. Where the assault units of many other Legions were known for their savagery or even outright bloodthirstiness, the Locutarus were universally of a disciplined and exacting mien. They practiced the arts of sword- and pistol-play with precision, their strikes perfectly timed and placed to maximum effect.
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This is part of a mauch larger Ultramarien commission, and you can find the full process on how these were painted via the Ultramarine Masterclass series.