https://youtu.be/USr6QiWtOOE The CBJ-MS is a submachine gun designed by Swedish arms developed Carl Bertil Johansson, perhaps better known for his remarkable armor-piercing 6.5x25mm CBJ cartridge. He developed the gun at about the same time as the cartridge, on his own time while working at the Carl Gustafs factory in Eskilstuna. While it bears a lot