Megadeth bassist Dave Ellefson posted the video above from the band's tour stop in Sioux City, Iowa, where he got a brand-new five-string Kelly Bird bass from Jackson Guitars, with whom he has a signature line of instruments. Watch him give it the official Ellefson bass test - playing the line from "Peace Sells...But Who's Buying?" of course.

Megadeth's U.S. tour winds down tomorrow night with their performance at Rocklahoma 2012 (where they'll be joined by Rob Zombie, Theory of a Deadman, Black Stone Cherry and Trivium, along with many, many other bands.