TFB reader Mehul emailed me some photos that his friend, a law enforcement officer, took of confiscated homemade pistols manufactured by Naxalite (communist) rebels in North East India.
Mehul said that when he was in India some years ago their backyard guns were very primitive. Automobile exhaust tubes were being used as barrels for crude muzzle loading blackpowder firearms. They appear to have improved their gun making skills since then.
James is right, I am fascinated by homemade weaponry.
Thanks to Mehul for the photos and info.