Warhammer Heavy Bolter

The new Forgeworld Heavy Bolter, aka pre-Heresy Heavy Bolter, aka 1st/2nd edition Heavy Bolter.
As opposed to the standard Astartes .75 calibre bolts, the Heavy Bolter fires 1" bolt projectiles. To guarantee steady shooting, this pattern is fired from the shoulder with a sturdy "Macro-Magazine", newer models are wielded "chainsaw-style" and are belt-fed from a backpack-mounted box, which holds more ammo but is also more susceptible to misfeeds.
Personally i prefer the old model, you can actually aim and shoot from cover without exposing too much of yourself.

EDIT: Updated model. Removed "cushion", added detail and skull, rounded edges.

EDIT2: Uploaded to the Google 3D Gallery
[link]

EDIT3: Replaced the plastic look with a more metallic sheen