Pit production is likely the rate limiting factor.
We disassembled a bunch of AFAPs so have a lot of weapons grade plutonium around. But Pu is nasty to work with & Rocky Flats--the previous pit production facility--closed down years ago. Pit production moved to Los Alamos but it is at a much reduced capability.
Also, Pantex--where nuclear weapons are assembled--isn't exactly the model for speed & efficiency.
We disassembled a bunch of AFAPs so have a lot of weapons grade plutonium around. But Pu is nasty to work with & Rocky Flats--the previous pit production facility--closed down years ago. Pit production moved to Los Alamos but it is at a much reduced capability.
Also, Pantex--where nuclear weapons are assembled--isn't exactly the model for speed & efficiency.