To be honest, I’ve opposed all gun control but never quite understood why, if we have background checks, we don’t always have background checks.
Background checks on private sales, by themselves, are unenforceable. You can't enforce background checks on private sales without knowing what guns are out there, and you can't do that without registration, and registration is just the opening act of confiscation.
Background checks on private sales are just the gateway drug to bigger and bigger infringements on our rights.