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Pipe Pistol for 9 mm Ammunition
A 9 mm pistol can be made from 1/4" steel gas or water pipe and fittings.
Improvised Black Powder
Black powder can be prepared in a simple, safe manner. It may be used as blasting or gun powder.
Page 96 - Potassium Nitrate
Potassium nitrate (saltpeter) can be extracted from many natural sources and can be used to make nitric acid, black powder and many pyrotechnics.