FIRSTLY: All thanks goes to SivHD for the video he put out about Chain-Gun-Bard. All credit goes to him. I don't think he showed the runes or masteries, but I watched the videos, and thought I'd make a trolly guide about it.
His channel: https://www.youtube.com/user/WQLFY
The Chain-Gun-Bard video: https://www.youtube.com/watch?v=HtYQR-xnmd4

Now onto the guide: My job is not to make you a good teammate, or a good Bard player. My job is to teach you that League of Legends is a GAME. Therefore you should have FUN PLAYING THE GAME.

PROS:
You move fast.
Bard has Illuminati tattooed on his face.
Also your taunt is amazing.
CONS:
You're utterly friggin' useless.
You don't talk, therefore can't trash-talk in-game without typing.
You have two peg-legs.

Press R. Left click in front of fleeing teammate. Walk up and spam laugh as enemy team kills him.

When a minion gets low health, right click it. If you see a gold colored number like this appear, +19, or something of the sort, you have correctly farmed one minion.

If you want to play a chain gun champion and do well, go play Lulu or something. This is not a legitimate guide, and therefore you should try this guide out. Leave a like if you liked it, and say why. Leave a dislike if you disliked it, and say why. Anything helps, guys! Have a wonderful day, my dear Summoners.