This comes from Pravda, so take it for what it’s worth:
Russia unveils fifth-generation Kalashnikov assault rifle
Russia’s largest firearms manufacturer, JSC Izhmash, unveiled its first model of the fifth-generation Kalashnikov assault rifle. The new rifle is tentatively called AK-12. … The Picatinny rails were integrated in the construction of the AK-12. The rails are used to mount additional equipment: optical, collimating and night sights, mexometer, grenade launchers, lights, target indicators and other equipment.
If you’re like me, you read that and immediately wondered… “Wait, what? A ‘mexometer’?” And no, I’ve no idea what it is. The AK-12 is said to be primarily for the export market, so… maybe it’s a special add-on to make it more salable to the Juarez drug cartels?