I can't imagine how long it must have taken video games to sync their guns to the song featured in this Call of Duty video, but wow. Mind, I wasn't particularly impressed until about the 1:15 mark -- at which point it's just like, whoa. Talk about breaking it down.
Here's the song that this is being synced to... and honestly? The Call of Duty version seems better!
There are more than just these ones, of course. Here are a few more:
Ridiculous Call of Duty Gun Sync [YouTube]