I am looking for the early history of this cartridge and gun. I understand it became available in the 1920s and was already widespread in the 1930s, but I am looking for exact dates and other details, including the actual designation of the gun – was it called the Model 201-Z from the start?
On a related note, I am looking for the book “Swearingen, Thomas, Tear Gas Munitions, An Analysis of Commercial Riot Gas Guns, Tear Gas Projectiles, Grenades, Small Arms Ammunition”, which presumably would help me find out about this (and similar questions about gas billies and hand grenades).
Can somebody help? Many thanks!