@BlueMonday1984 The "weapons grade" almost certainly means 239-Pu, which is used in bombs or fissile in reactors. (There are other isotopes but they're not really useful for fueling reactors *or* making bombs.)
I'm rather partial to the idea of silly valley oligarchs putting crude A-bombs under the table at one another's shareholder meetings.
@fullsquare AIUI for optimal nuclear weapons (ie. lightweight pits that maximize fission) you need to be very careful about which phase of metallic plutonium you use (it has dozens). IIRC an alloy with about 2% germanium in delta-phase is densest: make it with as close to 100% Pu-239 as you can get. (This was declassified in the 1970s.) You're also going to need some tritium gas to fill the hollow core, and other exotica (never mind the carefully timed explosive lenses to drive the implosion).