I appreciate the question and rational conversation on the matter.
I am absolutely for background checks and taking reasonable precautions that the person buying a firearm is legally allowed to possess one. It’s a common misconception that supporters of the 2nd Amendment oppose background checks all together, which simply isn’t true.
You said documenting who buys a firearm, and that is where it gets a little tricky… It’s illegal and goes against the 2nd Amendment for our government to have a national firearms registry (with the exception of NFA registered weapons like machine guns which is another matter that I won’t get into here). Why is that? I’m sure you have heard from people like me that registration leads to confiscation but perhaps nobody has explained that well. If the government has a list of every person that posses firearms & what kind, that can (and throughout history repeatedly has been) used for nefarious purposes of disarming its citizens.
When people say they want “universal background checks” and “closing the gun show loophole” let’s talk about what that really means. FFL dealers perform background checks. A private citizen doesn’t have the tools or resources to do so, and so currently one private individual selling to another isn’t required to perform a background check on the buyer. It’s important to note that it is a felony to knowingly sell a firearm to someone that legally cannot posses one.
I do object to a transaction between two private individuals to require a background check for a number of reasons. The biggest one of all, the only way to be able to enforce that as law is for the government to know who has the guns (a firearm registry). Think about it…how would the feds know that I sold a gun to my neighbor without a background check? The only way is to check a list to say that gun belonged to me and no background check was conducted on the buyer. This defeats the Second Amendment. That’s not the only reason I object to it, but I don’t want to make this super long & the reason I gave is the most important.