The SUB-2000 is a semi-automatic rifle chambered for the 9mm Luger or the .40 cal. S&W cartridge. Different versions of the SUB-2000 rifle will accept most double column handgun magazines . By rotating the barrel upwards and back, the SUB-2000 rifle can instantly be reduced to a size of 16.25 x 7 inches for ease of storage. This new Gen2 version features an updated stock, M-Lok Rail, & Threaded Barrel.