The SUB-2000 is a self-loading carbine for pistol cartridges with greatly enhanced accuracy and extended range compared to a handgun. The superior precision is very useful against small or partially covered targets at shorter range and the amount of training to master the SUB-2000 is only a fraction of that required for a handgun. In the creation of the Sub-2000, emphasis has been put on consumer safety, but without impeding the performance. Polymers are used to a large extent, resulting in increased durability and reduced price. By rotating the barrel upwards and back, the SUB-2000 can be reduced to a size of 16" x 7" to facilitate secure storage and utilize the internal deployment lock which is operated by a proprietary key. The rear sight is of aperture type and the fluorescent front sight can be adjusted for windage and elevation. The SUB-2000 can easily be disassembled for cleaning or inspection without tools.