Stan Johansen Miniatures released these at Historicon, and sold out of what we had. We just received a new shipment from the caster (as well as the 20mm Jihad Insurgent and Tech sets).
We will be adding crew figures for the MGs soon.
I have also just posted some photos of three new 20mm figure sets I am working on. Check them out here, and please let me know your comments and suggestions.