Taiwanese gang members have taken to making their own 12 gauge shotguns. The homemade handgun revolvers are incredibly powerful (they fire regular 12 gauge rounds) and are extremely imposing.
I can’t imagine what kind of kick homemade handgun revolvers would have--one misfire and you may lose your hand. Nor can I really understand the need to make your own gun, considering there are so many kinds out there. On the Taiwanese black market these handgun revolvers sell for between $7,000-$9,000.