 The Model 59 was manufactured in 9×19mm Parabellum caliber with a wider anodized aluminum frame, a straight backstrap, a magazine disconnect (the pistol will not fire unless a magazine is in place), and a blued carbon steel slide that carries the manual safety.The grip is of three pieces made of two nylon plastic panels joined by a metal backstrap.It uses a magazine release located to the rear of the trigger guard, similar to the M1911A1.