If you can find a first edition of A.B. Zhuk's book of line drawings of handguns, you'll find page after page of pictures of various types of pinfire revolvers. You'll find everything from 7mm pocket guns, to 11mm and 12mm service revolvers to 20 shot monstrosities with two rows of chambers in the cylinder.I had no idea that kind of cartridge even existed... pinfires are crazy! I just finished googling them for the last 20 minutes, very interesting. Anyone else who has not heard of pinfire before should do the same, neat stuff.