Regarding the 7.62x39 AKs, they are still in partial service in the Russian military, never having been phased out completely.
The majority of the 17 million older AKs the Russians are said to have in strategic reserve are in 7.62x39.
They're even buying some amount of new rifles in that caliber, in AK-15 guise.
https://www.interfax.ru/russia/657279
(translated)
The Russian Defense Ministry will receive 150,000. new Kalashnikovs in three years
Moscow. April 6. INTERFAX.RU - The Russian army will receive more than a hundred thousand Kalashnikov AK-12 and AK-15 assault rifles in the next three years, an informed source told Interfax.
"The Russian Defense Ministry and the Kalashnikov concern" have signed a three-year contract for the supply of 150,000. AK-12 and AK-15," the source said.
According to him, the army will receive 50,000. 2019, 2020 and 2021.
On December 20 last year, the Kalashnikov Media portal reported that the concern had started the first deliveries of AK-12 assault rifles as part of the state defense order. The volume of the shipment was 2.5 thousand machines.
The concern noted that the Russian Defense Ministry is the only customer of the AK-12, which will gradually replace the AK-74M in the troops.
The AK-12 was developed as part of the Ratnik program as an element of a promising complex of equipment for Russian Armed Forces soldiers.
New assault rifles - AK-12, AK-15 (Kalashnikov concern) and AEK-971 (Degtyarev plant) were tested for the current "Ratnik" machine guns. The Russian Defense Ministry said earlier that these assault rifles have been adopted.
In 2017, in an interview with Interfax, former Deputy Prime Minister of the Russian Federation (now the head of Roscosmos) Dmitry Rogozin said that the AK-12 will become an army assault rifle, AEK-971 will be armed with special forces.