In March of 2020, the Federal Gov processed over FOUR Million background checks for firearm purchases. That's just one month, and I know my purchase that month took 8 days to clear due to my common name, as well a military history.

Imagine the clusterfuck if they had to process 40 million checks monthly for all firearm and ammo purchases. It would crash the system. Completely unfeasible and as the laws read currently, illegal; since only firearm ownership is regulated, not ammunition.