The first commercial revolvers were made in 1856, yes, but they didn't meet widespread use until about two decades later.
@Scrapula
uhhh... maybe you mean revolvers using cartridge bullets.
(en.wikipedia.org/wiki/Revolver)
Elisha Collier of Boston, Massachusetts patented a flintlock revolver in Britain in 1818, and significant numbers were being produced in London by 1822.
@Lucifers 666 Sorry about this but I'm going to have to bow out. Hope you guys have fun.