I don't have a Jack, but I do have a number of 5.56 AKs. The Beryl by FB Radom is still available and is really high quality and what I generally recommend if you can swing a few hundred more.Do you like it? I've been looking for a 5.56 AK for a while and the market is pretty dry right now.
WBP is generally pretty good though. A commercial company, but they do work with the military company (FB Radom) quite a bit from what I see. They'd be my second choice on what's available new right now. I know a few guys who run them. I'll probably look to add one to the collection eventually. And they take more standard AKM furniture.
The Beryl takes some AKM, but it's more similar to a Tantal on furniture, specifically the upper handguard.
Just avoid Pioneer honestly.