The combigrav consists of a Phobos-pattern bolter, the top half of a Volkite Charger and half of the drum from a Terminator's storm bolter.
The goal throughout this small project has been to spend a little money as possible. These five guys are made from the various Space Marine bits I've had laying around for years and will serve as a nice interim project until my horde of Death Korps arrive in the mail.
If you look closely, you can see the occasional Grey Knight and Blood Angel bit on the model. The bolt pistol holsters are cut from chunks of green stuff and had pistol grips glued in the right place. This quick idea came from Ron, of From the Warp fame. Sadly, I can't find the tutorial in his archives.
More to come,
-Jordan