User blog comment:Sidorak12814/Unreleased Images/@comment-1429966-20100201133134

The grey guy's cannon is one of those new cannon pieces from the Lego Star Wars Imperial Dropship. The new ones have more space under them, so you can fit technic parts inside the track. I used one of those that has two round holes and an axle hole perpendicular to those. Then I stuck a red two-space axle through the perpendicular axle hole and his "fingers"