This single action, semi auto, magazine fed pistol has been a standard issue for the army since 1911 – used heavily in World War 1. Compact variants are popular choices for CCW. This is one of the best known and most widely replicated designs offered in a variety of calibers. Commonly .45 ACP’s but also .38 Super, 9×19mm Parabellum, .40 S&W, 10mm Auto, .22 LR, .357 SIG and others. The most popular alternative versions are 9×19mm Parabellum, .38 Super and 10mm Auto.