Spiny Norman said:

Hey Captain S, I wanted to check the numbers on how much highly enriched uranium was needed for a modern nuclear bomb. I couldn’t immediately find a value for that but I did for plutonium – about 6 kg.

The Fat Man device specifically used 6.2 kg

Still looking for a number for uranium.

From a few sources it seems like 15 kg to 25 kg.
Here’s one -https://zeenews.india.com/world/how-much-uranium-does-it-take-to-make-a-nuclear-bomb-and-how-much-does-iran-still-have-2924619.html