It is part of (planned??) incrementalism:
Step 1: Force owners to neuter property without turning it in (Atkins Accellerator)
Step 2: Force owners who have a not too expensive and very uncommon item to turn it in without compensation (bump stock)
Step 3: Similar to step #2, but target a widely sold product marketed by reputable first tier brands
Step 4: Similar to step #3, but target more expensive items at the edge of mainstream
Step 5: Target mainstream common products now that "surrender without compensation" has ample precedent.