Midsouth got resupplied with 6mm arc dies and are still in stock at the time of this posting.
https://www.midsouthshooterssupply.com/i...ip-spindle
https://www.midsouthshooterssupply.com/i...-2-die-set
https://www.midsouthshooterssupply.com/i...ip-spindle
https://www.midsouthshooterssupply.com/i...-2-die-set