Made almost entirely from machined aluminum by Kuba_T1000. It feeds plastic BBs from an electric ammo pack that holds 16,000 rounds. Check the embedded video for an impressive live-fire demo. [via Hack a Day]
I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I write for MAKE, serve as Technical Editor for MAKE magazine, and develop original DIY content for Make: Projects.