IF the information about the weapon were included in the back ground check, then sure that would be do-able. I mean 20 million a year is only 115 per hour, 8 hours a day 365 days a year, right? BUT as several people have already pointed out several times, there is no detailed info about the gun (like the SN) involved or transmitted during a background check. Only info about the BUYER.
Also that 20 million per year is only guns sold through FFLs - not private sales. Even in states like WA where the law says all sales have to go through an FFL with a background check, if there is no enforcement (which there currently isn't) then there are still a lot of private sales that aren't recorded. I'd wager that here in WA way over half of all private sales are still not going through the "required" FFL transfer. And very few states even HAVE an un-enforceable law that says private sales need to go through an FFL.
Lastly, that 20 million per year is just NEW sales - that doesn't do anything to get ANY of the older 4473 forms into digital format or anything resembling a database.
I still say that in practical terms, unless and until they pass a law that makes registration not only legal, but mandatory, trying to build an illegal registration database - and keep it secret - is, in effect, impossible.
If you read the OP, the subject was about FFls turning over their info to the feds upon closing. As far as collecting data for ongoing sales, it sounds like your state is doing it according to the above post and link.
You keep saying that no gun information is ever provided during a background check, just buyer info. I can tell you that in Tennessee, which is a point of contact state, the FFL must provide the following information to TBI to get an approval number on the background check.
The federal firearms license number of the dealer;
The business name of the dealer;
The place of transfer;
The name of the person making the transfer;
The make, model, caliber and manufacturer’s number of the firearm being transferred;
The name, gender, race, and date of birth of the purchaser;
The social security number of the purchaser, if one has been assigned; and
The type, issuer and identification number of the identification presented by the purchaser; and
Receive a unique approval number for the transfer from TBI and record this number on the firearm transaction record.
Tennessee law says that TBI is supposed to destroy records linking a specific firearm to a specific person. Yeah sure...
FFL system/background checks are the root of all gun control evil.
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For me it's not something I can escape anyway... I own NFA toys and have a handgun carry permit. I'm in the state and fed databases forever.