text: Percussion era In 1836, Samuel Colt patented the Colt Paterson, the first practical mass-produced revolver. It uses a revolving cylinder with multiple chambers aligned with a single, stationary barrel. Initially, this 5-shot revolver was produced in .28 caliber, with a .36 caliber model following a year later. As originally designed and produced, no loading lever was included with the revolver; a user had to partially disassemble the revolver to re-load it. Starting in 1839, a reloading lever and a capping window were incorporated into the design, allowing reloading without requiring partial disassembly of the revolver. This loading lever and capping window design change was also incorporated into most Colt Paterson revolvers that had been produced from 1836 until 1839. Unlike later revolvers, a folding trigger was incorporated into the Colt Paterson. The trigger only became visible upon cocking the hammer.
  Colt would go on to make a series of improved revolvers. The Colt Walker, was a single-action revolver with a revolving cylinder holding six charges of black powder behind six bullets (typically .44 caliber lead balls). It was designed in 1846 as a collaboration between Captain Samuel Hamilton Walker and American firearms inventor Samuel Colt. The 1847 Colt Walker was the largest and most powerful black powder repeating handgun that was ever made.