 The Police Undercover model comes in .357 Magnum, while the Pittbull models come in .45 ACP, .40 S&W, and 9×19mm Luger.Charter Arms also makes a variety of smaller frame .38 Special snubnosed models known as the Undercover made in standard, bobbed, shrouded and hammerless models.Charter also produces the Mag Pug in .357 Magnum and .41 Remington Magnum.