All time best gun from any COD game?

What do you think is the best gun ever when comparing all guns from COD?

Oh yeah, duh. I have not played every game, but I would have to say the M16 from COD4.

MP5 Silenced

AK-47 from Call of Duty 4 .... with a red dot.

I'm sorry, but we don't allow poll and list type threads on the GGD. They typically don't produce substantial discussion, as people just post their favorite thing and move on without reading anyone else's response.