Gravgun

Grav-gun are weapons used by Space Marines that directly affect the local gravity of the target, giving them an interesting effect in game.

It is range 18' S* AP2 Salvo 2/3 with Concussive and Graviton.

With the Graviton rule the gun doesn't roll to wound like normal, instead it wounds based on the targets armor save. For example anything with a 2+ will be easily wounded, while stuff with a 5+ will be harder to wound. When rolling to penetrate against vehicles a 1-5 will do nothing however a 6 will instantly immobilize it.

Grav weapons were introduced to the Marines in their new codex, however they have a rather mixed reputation amongst the player base. While they can easily kill MEQs they are largely useless against light armor. For this reason the weapon is largely panned by marine players as too situational to be effective.