Kalashnikov Media explains the main feature of the AKV-521 which is the version of the AK-12/AK-15 designed for the civilian market... "Today, people in Russia can hold 5 green slips for 5 smoothbore guns, and another 5 red slips for rifles. So, if one wanted to have two AKs - well, Saigas - chambered in 5.45, and also a 7.62 one, that'd mean three slots crossed out.