Reminds me of the "self-guided smart slug" from Cory Doctorow's Down and out in the magic kingdom, p.17 [0]

Incredible live-fire test video of bullets changing course mid flight to hit moving targets. [1]

[0]: http://craphound.com/down/Cory_Doctorow_-_Down_and_Out_in_th... [pdf]

[1]: http://www.military.com/video/ammunition-and-explosives/ammu... [video]