[Critias]

http://www.ar15.com/forums/t_3_118/579913_3D_printed_lower___yes__it_works_.html

Pretty awesome, in my opinion. 

[JustADude]

http://www.ar15.com/forums/t_3_118/579913_3D_printed_lower___yes__it_works_.html

Pretty awesome, in my opinion.

Oh yeah.

And they've got some higher-end 3D printers that can work using powdered steel. That means you could, theoretically, print EVERY part of a gun, even the barrel and chamber.

[Smileinbob]

check out this one http://openrov.com/ its a *fairly* affordable drone to the tune of 775 for a build your self and 1250 or so for it prefabed... but its a rov that you can do underwater exploring up to 100 meters with this rov and a laptop that can run chrome or firefox.. pretty spiffy imho...