Ok, so after a comment from the state of heresy thread, could this model be plastic?
I doubt it. Take a look at the fine details like spikes, rivets, the gloves and backpack holes. They're well defined as per a resin cast. Where, with plastic, they tend to be angled slightly so that it work in GWs mould machines. To me, there's too many undercuts, fine detail and the like that makes this more likely be a resin cast