Comment: I use Google Sketchup to

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I use Google Sketchup to

I use Google Sketchup to create models and then there is a plugin that you can install which will export the model to the required .stl format.

You can head over to several of the 3D printing sites and look at models available for download.

Thingiverse: www.thingiverse.com
Printable AR-15's: http://www.cncguns.com/downloads.html
More Guns: http://defcad.org/