One of the most sort after guns is the ak47 bb gun in the UK.The AK-46 was the first prototype by the famous Russian gun maker Mikhail Kalashnikov, The assault rifle chambered in at 7.62x39mm. It was designed in the year of 1946, and laid the foundations for Kalashnikov's later modifications to the series. It is a somewhat debated topic as to whether or not the AK series was more inspired by Kalashnikov picking certain aspects from various Russian and American rifle designs with perhaps a touch of German sub-machinegun traits, or if the StG-44 was the primary focus of Kalashnikov.
The German-made StG-44 did feature an upper and lower half of the rifle, very similar to early AK prototypes. You also will find that the USSR PPSh-41 had very similar characteristics. As did many other SMGs at the time.