BudsGunShop.com - Austria

Charles, they are still being made but are in low supply. It can be found in stock here : nwarmory.com/product/glock-pg2150203-g21-gen-4-double-45-automatic-colt-pistol-acp-4.6-131-black-interchangeable-backstrap-grip-black

This was just recently in stock at buds but it sold out fast.
Still in stock here
https://gun.deals/search/apachesolr_search/764503102035

due to the panic buying and the Covid caused restrictions and shutdowns the supply and production is at a all time low and with this gun you also have import restrictions
While I am sure that buds has them on order there is no way of knowing when it will be back in stock. I suggest that you use the notify me button. Buds will email you when they are back in stock This in no way obligates you to purchase the item. We are not buds employees we are volunteers that answer questions