This guy built functioning lego guns that shoot rubber bands.
[video=youtube;_e6mjhLKu3k]https://www.youtube.com/watch?v=_e6mjhLKu3k[/video]
And in this vid, he goes over some of the internal mechanisms. He's French, but puts in English subtitles.
[video=youtube;mJoFGlqafaA]https://www.youtube.com/watch?v=mJoFGlqafaA[/video]
[video=youtube;_e6mjhLKu3k]https://www.youtube.com/watch?v=_e6mjhLKu3k[/video]
And in this vid, he goes over some of the internal mechanisms. He's French, but puts in English subtitles.
[video=youtube;mJoFGlqafaA]https://www.youtube.com/watch?v=mJoFGlqafaA[/video]