When playing on the 0.47 experimental me and my friend heard an MP5-K being fired, we thought it was near us but there was nobody around. After dying at NE airfield later on and respawning we both heard the same sounds again, even though we weren't next to each other. We followed the direction that the sounds were coming from and we both ended up at the airfield. We also hear MP5-K gunfire when in Berezino later on. In total this happened to us three times across two separate experimental servers.