Firearms employed for concealed carry have small frames and are chambered for handgun rounds from .22LR to .45 ACP. Some of the most popular handguns for this purpose are chambered in .380 ACP, including the Kel-Tec P3AT, the Ruger LCP and the Bersa Thunder, reports Personal Defense World.
Popular 9-millimeter concealed-carry weapons include the Glock 26, the Smith & Wesson M&P, which is also available in .40 S&W, and the Kahr PM9, according to ConcealedNation.org. The Springfield XD-S 45, the Rock Island Armory 1911 Compact and the Glock 30S are available in .45 ACP, notes Guns America. North American Arms manufactures tiny pocket revolvers chambered in .22 Short, .22LR and .22 Magnum, explains its website.