This seems implausible. The number of guns used in crime is in the tens of thousands each year.
The number of guns sold this year was more than 20,000,000.
The number in circulation is greater than 400,000,000.
Even in Australia compliance with gun buybacks wasn’t much more than 50%, and they didn’t have a second amendment.
The idea that Guns will become scarce in the US any time soon is simply unrealistic.
As for the 10,000 glock, that situation is also just a fantasy.
In London criminals can simply rent guns, fairy cheaply but with a high deposit. They only discard them if they fire them in a crime, otherwise they return them and get their deposit back.
This way, even just one gun can be used by hundreds of criminals at minimal expense, and with little risk of being caught possessing an illegal weapon.