The first picture, are those the Dusk Raiders?
Fraid it's Death Guard Revan88. The Dusk Raiders wore grey armour with a crimson right arm: http://warhammer40k.wikia.com/wiki/Dusk_Raiders
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This is what I've been waiting to see and I cannot wait. I've finally settled on a method for painting my pre-heresey 1st Legion. It will be good to have you back in the Crusade Brother.