Before it was deemed dangerous or politically incorrect for young children to point pistols at each other and fire at will, cap guns were a staple of toy chests. The earliest ones were made of cast iron, later ones of plastic, but all used some form of mild explosive to create a popping sound and puff of smoke when the toy's trigger was pulled. Cap guns are named for this small cap, or capsule, of flammable material, which explodes upon contact with the trigger’s hammer mechanism.

The first cap guns date to the 1860s, immediately following the end of the American Civil War, when firearms companies experimented with toy guns in order to stay in business. These cast-iron weapons used paper strips enclosing sealed tablets of a gunpowder mixture, similar to tiny fireworks. Later toy-ammunition strips were designed to advance automatically, often including eight or 10 percussive caps in a single plastic round.

Many early cap guns were produced as novelty items with little resemblance to actual weaponry. These toys represented cartoon characters or animal figurines, like the “Sea Serpent” gun shaped like an underwater goblin, whose snapping jaws ignited the cap. The “Lightning Express” pistol was loaded by retracting a miniature steam engine; when released, the train careened down the weapon’s barrel to detonate its capsule with a satisfying pop. Other toys played on prevailing racial prejudices, like the “Chinese Must Go” gun which depicted an American immigration officer kicking a caricatured Chinese man, whose mouth would then fall closed on a gunpowder cap.

During the Great Depression, mobster shoot-outs by comic-strip icons like Dick Tracy made every elementary-school pipsqueak long for a gun of their own. Well-known cap gun manufacturers of the era included Nichols, Esquire, Daisy, Halco, and Stevens, as well as larger toy companies like Hubley and Marx. By 1935, concerned parents like Chicago’s Rose Simone were organizing toy-gun bonfires in an attempt to eradicate the violent toys.

However, the stories of American heroics during World War II, along with the popularity of Western films, served to glorify guns and their miniature toy replicas. Cap guns became associated with cowboy movie characters such as Roy Rogers, Buck Jones, Gene Autry, and Hopalong Cassidy. In the 1950s, an endless stream of merchandising for Western-themed television shows put miniature guns in the hands of millions. Young fans of "Johnny West," "The Lone Ranger," "Gunsmoke," "Bat Masterson," "The Rifleman," "Maverick," and "Bonanza" could own a pistol emblazoned with the name of their favorite show or character.

In 1955, Mattel launched its noisy, fully-automatic “Burp” gun, which it promoted through a year sponsorship of the Mickey Mouse Club television show. Ads featuring mini-machine-gun toting youngsters played during every episode. A few years later, in 1958, Mattel released its extremely successful "Fanner" cap gun line, which allowed kids to fire their guns in rapid succession by hitting the hammer directly, without actually having to pull the trigger. Though no real bullets shot from these guns, kids could load them with realistic-looking plastic cartridges.

Mattel also created a series of “Shootin’ Shell” guns and playsets, which fired plastic bullets that could be coupled with its “Greenie Stik-M-Caps” to create the desired popping sound. The cap gun craze finally slowed during the '60s and '70s, though, when images of bloodshed in Vietnam and increasing parent protest cast the toys in an unflattering light. Finally, in 1988, the U.S. Federal Toy Gun Law made it illegal to sell any "look-alike firearm," including toy cap guns, without a "permanently affixed," bright-orange plug in the end of its muzzle. In fact, even vintage cap guns are now required to be sold with this orange marker, as a casual glance of cap guns for sale on eBay reveals.

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