Volley gun
Two notable artillery-sized volley guns were developed in the mid-19th century, although neither was particularly successful in practice. Developed in the 1860s and based on an 1850s design by a captain Fafschamps, the French mitrailleuse is an example of a multi-barreled volley gun that could fire all of its barrels simultaneously or sequentially over a short period of time. Also developed in the 1860s, General Origen Vandenburgh of the New York State Militia designed a weapon that had eighty five parallel .50 caliber rifle barrels. After failing to sell the weapon to the United Kingdom, he reportedly sold a small number to the Confederate States of America, although there is no record that they were actually used. One Vandenburgh gun was located at Fort Fisher, North Carolina, and another reportedly at Salisbury, NC.
Pocket pistol
The Walther PP ("Polizeipistole", or police pistol) series pistols were introduced in 1929 and are among the world's first successful double action, blowback-operated semi-automatic pistols, developed by the German arms manufacturer Carl Walther GmbH Sportwaffen. They feature exposed hammers, a traditional double-action trigger mechanism, and a fixed barrel that also acts as the guide rod for the recoil spring. It was offered in both .32 ACP (9-shot) and .380 ACP (8-shot) calibers. The Walther PP and smaller PPK models were both popular with European police and civilians for being reliable and concealable. They would remain the standard issue police pistol for much of Europe well into the 1970s and 80s. During World War II, they were issued to the German military, including the Luftwaffe.
The Smith & Wesson Model 36 was designed in the era just after World War II, when Smith & Wesson stopped producing war materials and resumed normal production. For the Model 36, they designed a small concealable 5-shot revolver with a 2" barrel that could fire the more powerful .38 Special cartridge. Since the older I-frame was not able to handle this load, a new frame was designed, which became the J-frame.