Paul thought you might be interested in the concept.
Dave Smith 3


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Build your own gun!

http://www.designnews.com/author.asp?section_id=1394&doc_id=255741&cid=NL_Newsletters+-+DN+Daily


http://tinyurl.com/ceg8xnk

"In October, Stratasys terminated the group's 3D printer lease and
 seized the equipment from a member's home."


Stratasys is a very expensive device. Around $30,000 last time I checked.
I used the local junior college Stratasys to build some patterns for a
turbo intake manifold a few years ago. You cannot make high stress or metal
parts directly as far as I know. Only plastic  patterns for castings.

It is rather easy to build a 3D printer. It is basically a hot glue gun married
to a plotter. However it would be better to invest in an NC mill for gun parts.
Richard Sohn built his own to make one rotor parts.

I was always wondering how a smooth bore tank canon shell keeps from
tumbling. Perhaps it has spring loaded fins that cause it to spin.
The hard part in making guns is the riffling in the bore that causes the
bullet to spin.

It probably easier to build gyro stabilized rockets with video homing.

http://www.instructables.com/id/Intro-to-Model-Airplane-Autopilot/


Paul Lamar