They are allready out there. http://projectsentrygun.rudolphlabs.com/ http://projectsentrygun.rudolphlabs.com/ http://realsentrygun.com/ http://realsentrygun.c

They are allready out there. http://projectsentrygun.rudolphlabs.com/ http://projectsentrygun.rudolphlabs.com/ http://realsentrygun.com/ http://realsentrygun.com/ http://paintballsentry.com/Videos.htm http://paintballsentry.com/Videos.htm also, with OpenCV, cheap hobby servos, webcams and 35$ Raspis, and 40$ AKs, the parts are pretty easy to come by.