When choosing Gravity gun ammo, take a few things into consideration. You can distinguish this Gravity Gun by the blue hue it gives off instead of the normal orange one. Towards the end of the game, the Gravity Gun will be 'supercharged' so that it is more powerful and can pick up organic materials - the Gravity Gun can just about pick up anything that's not nailed down at that point. Objects too distant to be picked up outright can sometimes be pulled towards the user with secondary fire. Alternate fire uses a tractor beam that grasps objects (provided they are light enough), allowing them to be thrown with greater accuracy using primary fire, or dropped into place by pressing alternate fire again (this also works on manhacks and pulse rifle alt-fire shots). Primary fire projects a powerful beam of energy (often called a 'punt') at objects that knocks them away (this also works on headcrabs, ant lions, manhacks, and scanners). This is useful for all kinds of things, ranging from physics puzzles to actual combat. While technically not a weapon, the Gravity Gun allows you to pick stuff up and blast it away at high speed. Best used against: Obstacles, headcrabs (all types), zombies, Combine soldiers, manhacks, ant lions.Max damage: Zero-Instant kill/Instant kill.

Half life 2 rocket launcher