Google image Search = Homemade Guns.

Remember you live in an industrial society that where there is a demand for something and someone is willing to pay someone is going to step in and meet the demand.

Apparently the small Submachine Guns are the easiest to make; see the below site.
Impro Guns


http://www.kk.org/streetuse/archives/weapons/

http://boingboing.net/2007/06/15/homemade-firearms-of.html

http://www.sodahead.com/united-states/ammunition-accountanility-acthes-not-even-in-office-and-here-he-comes/question-197313/?link=ibaf&q=guns%2Bmade%2Bin%2Bprison&imgurl=http://img211.imageshack.us/img211/4434/24435765mt0.jpg

http://www.techeblog.com/index.php/tech-gadget/you-won-t-believe-these-were-made-by-criminals

http://www.thefirearmblog.com/blog/2010/01/13/homemade-9mm-pistol/

http://www.correctionsone.com/contraband/articles/1961780-15-deadly-improvised-prison-weapons-and-tools/

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