text: The COP .357 is a modern 4-shot Derringer-type pistol chambered for .357 Magnum. Introduced in 1983, it is a double-action weapon about twice as wide, and substantially heavier than the typical .25 automatic pistol. Still, it is relatively compact size and a powerful cartridge makes it an effective defensive weapon or a police backup gun. The COP .357 is quite robust in design and construction. It is made of solid stainless steel components. Cartridges are loaded into the four separate chambers by sliding a latch that "pops-up" the barrel for loading purposes, similar to top-break shotguns. Each of the four chambers has its own dedicated firing pin. It uses an internal hammer, which is activated by depressing the trigger to hit a ratcheting/rotating striker that in turn strikes one firing pin at a time. Older "pepperboxes" also used multiple barrels, but the barrels were the part that rotated. The COP .357 operates similarly to the Sharps derringer of the 1850s, in that it uses the ratcheting/rotating striker, which is completely internal, to fire each chamber in sequence.
  Semi-automatic pistols
  In 1896, Paul Mauser introduced the Mauser C96, the first mass-produced and commercially successful semi-automatic pistol, which uses the recoil energy of one shot to reload the next. The distinctive characteristics of the C96 are the integral 10-round, box magazine in front of the trigger, the long barrel, the wooden shoulder stock which gives it the stability of a short-barreled rifle and doubles as a holster or carrying case, and a unique grip shaped like the handle of a broom. The grip earned the gun the nickname "broomhandle" in the English-speaking world, because of its round wooden handle.