"The world's first gun made with 3D printer technology has been successfully fired in the US. The controversial group which created the firearm, Defense Distributed, plans to make the blueprints available online. The group has spent a year trying to create the firearm, which was successfully tested on Saturday at a firing range south of Austin, Texas." - × × ×

“US State Department orders removal of Defense Distributed's printable gun designs” — http://boingboing.net/2013... - × × ×

Там из видео понятны ответы на многие твои вопросы =) И по калибру, и по принципу заряжания. - penis mightier than sword