“Biden administration proposes to confiscate the more than 20 million modern sporting rifles that are in circulation today.”
First they have to find them. Guns don’t register themselves and owners won’t volunteer.
Time to start kicking in doors and snitching on neighbors.
Best places to conceal a gun is in an old junk yard, car salvage yard, or where a house has burned. Lots of iron nails and other junk causes all kinds of problems with their ground penetrating radar.
Or you can just sow the ground with lots of iron washers and nails.