Once the Democrats get the control they need in DC, they won’t have to bother buying back anything, they’ll simply ask politely for them...and turn the screws on those who don’t immediately comply.
As to what they can do in DC to the holdouts with a few keystrokes - think IRS on steroids.
And if they can realize their wet dream of a digital currency, turn off the ability to buy ammo. Just like turning off a faucet