Hey, look! Stuff I made is in Uncharted 3! 

“How to obtain: exclusive to PAX Prime. Attendees of PAX Prime received a voucher code to redeem.

What it does: exclusive Cory Schmitz artwork from PAX Prime depicting Drake, Elena, the Cargo Plane and a cool U3 logo design teamed up with Clip Size and Reload Speed mods.” (via Unique Weapons in Uncharted 3 Multiplayer- Part 1: Pistols)