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I've just got my hands on some grav guns and I'm not sure how to paint them! I don't have the codex(I'm a painter nowadays)so I was wondering;
1) What kind of weapon are they? What do they fire?
2) How is best to show this in terms of paintwork?
3) What about the backpack? The guns I have are Kromlech so don't have packs so I'll have to model them so was wondering what the power/fuel source is meant to be?
This is not a rules question! I don't want ranges or anything.
Just the facts!

http://warhammer40k.wikia.com/wiki/Grav-Gun
http://warhammer40k.wikia.com/wiki/Grav-weaponry
http://wh40k.lexicanum.com/wiki/Graviton_gun

About the best info I could find on them. They make a pistol, assault version and a heavy weapon version, the heavy is the only one with a back pack.

I have no idea either - but maybe search the gallery? Could find some examples of how it was done by others