 Another example is the Kel-Tec SUB-2000 series chambered in either 9mm Luger or .40 S&W, which can be configured to accept Glock, Beretta, S&W, or SIG pistol magazines.The SUB-2000 also has the somewhat unusual (although not unique) ability to fold in half.The primary advantage of a carbine over a pistol using the same ammunition is controllability.