The AKM has a barrel which has a chrome-lined bore and 4 ideal-hand grooves at a 240 mm (1 in nine.forty five in) or 31.five calibers rifling twist fee. The ahead barrel trunnion includes a non-threaded socket for that barrel and also a transverse gap for any pin that secures the barrel in place. The AKM's barrel is mounted during the ahead trunni… Read More