NRA Museums special projects coordinator Ernie Lyles shows John Popp the Smith & Wesson Model 53 22 Remington Jet revolver. It was created in 1961 at a time when new rounds were being introduced. It was advertised as firing 2,400 feet/second! But it was hard really reaching that goal. Steel adapters allowed the use of .22 long rifle ammo, or you could use the special .22 cylinder instead. It only worked if you kept the firearm meticulously clean and dry. They were discontinued in 1974. See this and other fascinating firearms at the NRA National Firearms Museum in Fairfax, Virginia.