Actually that firearm from the screencaps of CSI:NY is possible. They are sometimes called "Zip Guns" or "Gas Pipe Guns" They are not accurate, and very dangerous to mess with. Obviously the steel of a gas pipe is not the same as the steel used in a handgun, there is no rifling and using a sharp nail to set off the primer is unreliable at best.
Zip Guns were more common in the first half of the 20th century. I get the impression that they were almost a status symbol with some gangbangers. I've seen a few dating back fifty and sixty years in evidence vaults and some of them show some real workmanship. Others are pretty crude. But I would guess that a Zip Gun might help one get a better gun.
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