Pretty simple to build. The full-auto is a nice touch.
That would inflict some nice damage on nuisance birds like crows and pigeons. Not to mention it would also be real quiet for city use.
Full-Auto Air Compressor BB Gun
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there’s a whole forum’s worth of such projects
http://www.spudfiles.com/
This is the BB machine gun section: http://www.spudfiles.com/forums/bbmg-strafer-showcase-f10.html
Awesome stuff!
Machine gun in NJ. Check your local laws first, folks.
It’s a damn shame, too.