Your Top 3 favoret Sience fiction gun?

[Jim From Accounting]

So guys the question is the title. It can be from games and movies, TV shows and so on.

My top 3 would be :
1)http://starwars.wikia.com/wiki/DC-17m_Interchangeable_Weapon_System one of the cooler weapons in the SW games to me.
2)http://sciencefictionstarsystem.wikia.com/wiki/AMR-B05_Assault_Rifle from district 9
3)http://redfaction.wikia.com/wiki/Mason%27s_Nano_Rifle from Read faction, because it Om nom nom's on things.

 

[siffty]

1) Portal gun
2) phaser from startreck: enterprise
3) Wookie bow caster

 

[Kirchhoff42]

1. Portal gun
2. laser rifle Fallout 3
3. zero point energy manipulator Half life 2