A friend who was active Army SF, then NG SF with multiple deployments; alternated from NG deployments with security contracting gigs in Iraq. On one contract with a top name company in the genre they were in a big rush and their equipment (incl carbines) hadn't caught up with them yet.
They were offered a 55 gal drum full of AKs and told to pick one. One younger fellow; recently off military service quit on the spot! lol
Well this team was working security for a couple days non-stop before a break but with no gunfights thankfully. On his first shot finally test firing this AK; it grenaded on him. He was glad it had not come to shooting in those two days! About then their proper M4 type rifles etc showed up and all was good after that.
Anyway, do let us know.