Being able to track sales/disposition of a firearm to the "last purchaser" is a de facto registration scheme. It presupposes a database tying the firearm to purchase records. So no, a background check does not equal registration, but penalties for failure to report a transfer/sale/theft do. The current NICS background check is NOT tied to a particular firearm, but the purchaser only, and thus creates no trackable chain of custody for a particular gun.A serial number trace goes to the FFL that filled out the 4473 and maybe the initial purchaser. Some good detective work might be able to tie that to a given NICS approval. Any program that ties a weapon to the owner by serial number is a registration scheme, which is one step from confiscation. No thank you.