Clever reference to the Battle of Lexington & Concord. I liked that.
This approach failed in the states of NY and CT in 2013 when those states passed bills mandating registration of semi-auto rifles and magazines with >10 round capacity in the aftermath of the 2012 Sandy Hook Elementary School mass shooting. The vast majority of private citizens who owned these firearms refused to comply because the state governments simply didn't know who owned the weapons and therefore had no way to enforce it.
This bill essentially repeals the clause in the Firearm Owners Protection Act (FOPA, aka the McClure-Volkmer Act) of 1986 which prohibits the federal government from creating a national firearm registry for Title I firearms (i.e., the vast majority of firearms that are not covered by the NFA 1934).
I have long thought the DemonRats will push through a bill to create a national firearm registry using ATF (Bureau of Alcohol, Tobacco, Firearms and Explosives) Form 4473 records which have been used in all FFL (Federal Firearm Licensed) dealer sales since the Gun Control Act (GCA) of 1968.
This new bill from SJL is the long feared universal background check. Fedzilla will mandate that citizens in possession of firearms that don't have current ATF 4473 records must proceed to FFL dealers and register/ apply for new ones. A big information void exists of those firearms which have already been transferred in private transactions since the creation of their original ATF 4473 records (going back as far as 1968), i.e., there is no record of who owns these firearms now. As in NY & CT in 2013, it would not be surprising if the majority of such firearm owners quietly refuse to comply. But in the DemonRat socialist mindset, any identification leading to partial confiscation is better than none at all. The probability of positive identifications would be expected to be high on ATF 4473 records that are <10 years old. And there has been a huge, continuous run on firearm sales since POTUS #44 BHO was elected in NOV 2008.
A nightmare scenario would have Fedzilla weaponize the IRS to levy financial penalties on those determined to be in non-compliance with registration. Few could withstand that level of financial pressure.