They're made from a mixture of Grey Hunter box pieces and the Forgeworld MKIV Heavy Support Squad. The big guns are all Forgeworld- the over the shoulder missile launchers were just too awesome to pass up. While I prefer the over the shoulder heavy bolter that comes in one of their weapons kits, these underslung ones come in a pack of five. More fiscally responsible to buy them that way.
I also managed to finish up the armor conversions on my Thunderwolf Cav riders and get them primed. The wolves themselves have been finished and painted for a bit, but I was dragging my feet on the riders. No more!
It's a little hard to see in the image, bt they all have a raised skull Great Company logo! Yes, indeed they do! I made a mold from the fanged skull on a Storm Shield from the Thunderwolf Cavalry box and used it to make many, many skulls to use as my Great Company logo. I will be doing a tutorial shortly on how I made them and how I affixed them.
Unfortunately, I have some exams soon and between them and some personal things going on, I don't know exactly I'll get to painting these guys. But my first priority is working on the rest of the Grey Hunters. They all have heads now, so that's a plus, and a right few of them even have all their arms. It's just a matter of finishing the armor and chainsword conversions.