About БАЛЛИСТИЧЕСКИЙ НАПАШНИК - 3 ЛЕПЕСТКА
The AKM provides a barrel with a chrome-lined bore and four ideal-hand grooves at a 240 mm (one in 9.45 in) or 31.five calibers rifling twist level. The ahead barrel trunnion contains a non-threaded socket to the barrel as well as a transverse gap for any pin that secures the barrel set up. The AKM's barrel is mounted from the forward trunnion and