When RPE started selling Critical mass, they only sold the metal figures - they weren't set up for casting resin figures. As far as I'm aware they are slowly working through the backlog, developing masters and casting them.in metal but it takes time - I've bought some of the Khanate suits in metal from RPE to go alongside some of the original resin ones. I've found them to be very helpful in the past when I've phoned them about issues with the Critical Mass figures, but I've rarely used email to contact them.